I have a Paladin6/Monk14 build I'm working on that has very high healing amp and is a master in slaughtering undead.
Code:
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paladin monk
Level 28 Lawful Good Human Male
(6 Paladin \ 14 Monk \ 8 Epic) 
Hit Points: 393
Spell Points: 140 
BAB: 16\16\21\26\26
Fortitude: 20
Reflex: 15
Will: 19

                  Starting          Feat/Enhancement
Abilities        Base Stats          Modified Stats
(32 Point)       (Level 1)             (Level 28)
Strength             14                    14
Dexterity            16                    17
Constitution         14                    15
Intelligence          8                     8
Wisdom               16                    24
Charisma              8                     9

                  Starting          Feat/Enhancement
                 Base Skills         Modified Skills
Skills           (Level 1)            (Level 28)
Balance               3                    11
Bluff                -1                     7
Concentration         6                    39
Diplomacy            -1                     7
Disable Device       n/a                    n/a
Haggle               -1                     7
Heal                  7                    24
Hide                  3                    11
Intimidate           -1                     7
Jump                  2                    28
Listen                3                    15
Move Silently         3                    11
Open Lock             n/a                  n/a
Perform              n/a                    n/a
Repair               -1                     7
Search               -1                     7
Spellcraft           -1                     7
Spot                  3                    38
Swim                  2                    10
Tumble                n/a                  12
Use Magic Device     n/a                    n/a

Level 1 (Paladin)
Feat: (Deity) Follower of the Sovereign Host
Feat: (Selected) Toughness
Feat: (Human Bonus) Two Weapon Fighting


Level 2 (Paladin)


Level 3 (Paladin)
Feat: (Selected) Dodge


Level 4 (Paladin)


Level 5 (Paladin)


Level 6 (Paladin)
Feat: (Selected) Improved Two Weapon Fighting
Enhancement: Knight of the Chalice (Pal) - Slayer of Evil I (Rank 1)
Enhancement: Knight of the Chalice (Pal) - Courage of Heaven (Rank 1)
Enhancement: Knight of the Chalice (Pal) - Slayer of Evil II (Rank 1)
Enhancement: Knight of the Chalice (Pal) - Extra Remove Disease (Rank 1)
Enhancement: Knight of the Chalice (Pal) - Extra Remove Disease (Rank 2)
Enhancement: Knight of the Chalice (Pal) - Extra Remove Disease (Rank 3)
Enhancement: Knight of the Chalice (Pal) - Extra Smite (Rank 1)
Enhancement: Knight of the Chalice (Pal) - Extra Smite (Rank 2)
Enhancement: Knight of the Chalice (Pal) - Attack Boost (Rank 1)
Enhancement: Knight of the Chalice (Pal) - Attack Boost (Rank 2)
Enhancement: Knight of the Chalice (Pal) - Attack Boost (Rank 3)
Enhancement: Knight of the Chalice (Pal) - Action Boost: Melee/Ranged Power (Rank 1)
Enhancement: Knight of the Chalice (Pal) - Action Boost: Melee/Ranged Power (Rank 2)
Enhancement: Knight of the Chalice (Pal) - Action Boost: Melee/Ranged Power (Rank 3)
Enhancement: Knight of the Chalice (Pal) - Improved Restoration (Rank 1)
Enhancement: Knight of the Chalice (Pal) - Exalted Smite (Rank 1)
Enhancement: Knight of the Chalice (Pal) - Exalted Smite (Rank 2)
Enhancement: Knight of the Chalice (Pal) - Exalted Smite (Rank 3)
Enhancement: Knight of the Chalice (Pal) - Censure Demons (Rank 1)
Enhancement: Knight of the Chalice (Pal) - Empowered Smite (Rank 1)


Level 7 (Monk)
Feat: (Monk Bonus) Stunning Fist
Enhancement: Knight of the Chalice (Pal) - Vigor of Life (Rank 1)
Enhancement: Knight of the Chalice (Pal) - Vigor of Life (Rank 1)


Level 8 (Monk)
Feat: (Monk Bonus) Mobility
Enhancement: Knight of the Chalice (Pal) - Improved Restoration (Rank 2)
Enhancement: Knight of the Chalice (Pal) - Improved Restoration (Rank 3)
Enhancement: Henshin Mystic (Mnk) - Riddle of Fire (Rank 1)
Enhancement: Shintao (Mnk) - Bastion of Purity (Rank 1)


Level 9 (Monk)
Feat: (Selected) Improved Critical: Bludgeoning Weapons
Feat: (Monk Path) Path of Harmonious Balance: Fists of Light
Enhancement: Henshin Mystic (Mnk) - Way of the Patient Tortoise (Rank 1)
Enhancement: Shintao (Mnk) - Deft Strikes (Rank 1)


Level 10 (Monk)
Enhancement: Shintao (Mnk) - Protection from Tainted Creatures (Rank 1)
Enhancement: Shintao (Mnk) - Deft Strikes (Rank 2)
Enhancement: Shintao (Mnk) - Conditioning (Rank 1)


Level 11 (Monk)
Enhancement: Shintao (Mnk) - Deft Strikes (Rank 3)
Enhancement: Shintao (Mnk) - Conditioning (Rank 2)
Enhancement: Shintao (Mnk) - Conditioning (Rank 3)


Level 12 (Monk)
Feat: (Monk Bonus) Precision
Feat: (Selected) Spring Attack
Enhancement: Knight of the Chalice (Pal) - Censure Outsiders (Rank 1)
Enhancement: Knight of the Chalice (Pal) - Sealed Life (Rank 1)
Enhancement: Shintao (Mnk) - Iron Hand (Rank 1)


Level 13 (Monk)
Enhancement: Knight of the Chalice (Pal) - Vigor of Life (Rank 1)
Enhancement: Shintao (Mnk) - Smite Tainted Creature (Rank 1)


Level 14 (Monk)
Enhancement: Shintao (Mnk) - Fists of Iron (Rank 1)
Enhancement: Shintao (Mnk) - Jade Strike (Rank 1)


Level 15 (Monk)
Feat: (Selected) Greater Two Weapon Fighting
Enhancement: Shintao (Mnk) - Wisdom (Rank 1)
Enhancement: Shintao (Mnk) - Tomb of Jade (Rank 1)


Level 16 (Monk)
Enhancement: Human - Human Versatility: Defense Boost (Rank 1)
Enhancement: Human - Improved Recovery (Rank 1)


Level 17 (Monk)
Enhancement: Human - Human Adaptability: Constitution (Rank 1)
Enhancement: Human - Human Versatility: Saves Boost (Rank 1)
Enhancement: Human - Human Adaptability: Charisma (Rank 1)


Level 18 (Monk)
Feat: (Selected) Grandmaster of Forms????
Enhancement: Human - Human Versatility: Spell Power Boost (Rank 1)
Enhancement: Human - Action Surge: Wisdom (Rank 1)
Enhancement: Human - Action Surge: Wisdom (Rank 2)
Enhancement: Shintao (Mnk) - Argent Fist (Rank 1)


Level 19 (Monk)
Enhancement: Human - Action Surge: Constitution (Rank 1)
Enhancement: Human - Action Surge: Constitution (Rank 2)
Enhancement: Human - Improved Recovery (Rank 1)


Level 20 (Monk)
Enhancement: Human - Improved Recovery (Rank 1)
Enhancement: Shintao (Mnk) - Wisdom (Rank 1)


Level 21 (Epic)
Feat: (Selected) Epic: Improved Martial Arts


Level 22 (Epic)


Level 23 (Epic)


Level 24 (Epic)
Feat: (Selected) Epic: Overwhelming Critical


Level 25 (Epic)


Level 26 (Epic)
Feat: (Epic Destiny) Epic Destiny: Tactician


Level 27 (Epic)
Feat: (Selected) Epic: Blinding Speed


Level 28 (Epic)
Feat: (Epic Destiny) Epic Destiny: Elusive Target
I gain my 12th monk level (and Master stances) at character level 18.
My question is this: Can I take Grandmaster of Forms as my 18th level feat selection?
Any feedback would be appreciated.