Geared out properly, I think this would be an extremely fun toon to play.
Some of the enhancements are likely to be changed to add some fire spec. I just kind of threw them together quickly. I'm also considering dropping Dex a bit, raising Str, and going Acrobat.
Many of you will scoff at how many ranks I have in tumble by the end, but I've found that a properly twitched tumble is quite useful, and fits into my playstyle.
Code:
Character Plan by DDO Character Planner Version 3.14
DDO Character Planner Home Page

Level 20 Lawful Good Halfling Male
(3 Monk \ 10 Rogue \ 7 Wizard) 
Hit Points: 234
Spell Points: 409 
BAB: 12\12\17\22
Fortitude: 12
Reflex: 21
Will: 16

                  Starting          Feat/Enhancement
Abilities        Base Stats          Modified Stats
(32 Point)       (Level 1)             (Level 20)
Strength             12                    16
Dexterity            16                    26
Constitution         14                    16
Intelligence         14                    18
Wisdom               15                    18
Charisma              8                    10

Tomes Used
+2 Tome of Strength used at level 7
+2 Tome of Dexterity used at level 7
+2 Tome of Constitution used at level 7
+2 Tome of Intelligence used at level 7
+2 Tome of Wisdom used at level 7
+2 Tome of Charisma used at level 7

                  Starting          Feat/Enhancement
                 Base Skills         Modified Skills
Skills           (Level 1)            (Level 20)
Balance               7                    19
Bluff                -1                     2
Concentration         4                    26
Diplomacy            -1                     0
Disable Device        6                    27
Haggle               -1                     0
Heal                  2                     6
Hide                  6                    17
Intimidate           -1                     0
Jump                  4                    15
Listen                2                     6
Move Silently         6                    17
Open Lock             7                    12
Perform              n/a                    n/a
Repair                2                     4
Search                6                    27
Spot                  6                    27
Swim                  1                     3
Tumble                6                    18
Use Magic Device      3                    23

Level 1 (Rogue)
Feat: (Selected) Two Weapon Fighting

Level 2 (Monk)
Feat: (Monk Bonus) Toughness

Level 3 (Wizard)
Feat: (Wizard Bonus) Extend Spell
Feat: (Selected) Least Dragonmark of Healing

Level 4 (Monk)
Ability Raise: STR
Feat: (Monk Bonus) Weapon Finesse

Level 5 (Monk)
Feat: (Monk Path) Philosophy - Path of Harmonious Balance

Level 6 (Wizard)
Feat: (Selected) Lesser Dragonmark of Healing

Level 7 (Wizard)

Level 8 (Wizard)
Ability Raise: STR

Level 9 (Rogue)
Feat: (Selected) Greater Dragonmark of Healing

Level 10 (Wizard)
Feat: (Wizard Bonus) Maximize Spell

Level 11 (Wizard)

Level 12 (Wizard)
Ability Raise: DEX
Feat: (Selected) Power Attack

Level 13 (Rogue)

Level 14 (Rogue)

Level 15 (Rogue)
Feat: (Selected) Improved Two Weapon Fighting

Level 16 (Rogue)
Ability Raise: DEX

Level 17 (Rogue)

Level 18 (Rogue)
Feat: (Selected) Greater Two Weapon Fighting

Level 19 (Rogue)

Level 20 (Rogue)
Ability Raise: DEX
Feat: (Rogue Bonus) Cripling Strike

Enhancement: Rogue Damage Boost I
Enhancement: Rogue Damage Boost II
Enhancement: Rogue Haste Boost I
Enhancement: Rogue Haste Boost II
Enhancement: Rogue Haste Boost III
Enhancement: Rogue Skill Boost I
Enhancement: Extra Dragonmark Use I
Enhancement: Extra Dragonmark Use II
Enhancement: Extra Dragonmark Use III
Enhancement: Extra Dragonmark Use IV
Enhancement: Halfling Dexterity I
Enhancement: Halfling Dexterity II
Enhancement: Halfling Cunning I
Enhancement: Halfling Cunning II
Enhancement: Halfling Guile I
Enhancement: Halfling Guile II
Enhancement: Rogue Item Defense I
Enhancement: Rogue Subtle Backstabbing I
Enhancement: Rogue Subtle Backstabbing II
Enhancement: Monk Improved Recovery I
Enhancement: Fists of Light
Enhancement: Disciple of Breezes
Enhancement: Disciple of Puddles
Enhancement: Racial Toughness I
Enhancement: Racial Toughness II
Enhancement: Rogue Sneak Attack Accuracy I
Enhancement: Rogue Sneak Attack Accuracy II
Enhancement: Rogue Sneak Attack Training I
Enhancement: Rogue Sneak Attack Training II
Enhancement: Rogue Sneak Attack Training III
Enhancement: Rogue Sneak Attack Training IV
Enhancement: Wizard Energy of the Scholar I
Enhancement: Wizard Energy of the Scholar II
Enhancement: Rogue Dexterity I
Enhancement: Rogue Dexterity II
Enhancement: Rogue Dexterity III
Enhancement: Wizard Intelligence I
Enhancement: Wizard Intelligence II
Enhancement: Monk Wisdom I
I don't post many of my builds here, so let the bashing begin.