I've been kicking around this build for a week now. The main reason for me to play with it was to test how well a non-pure monk can stack up to monk abilities.
The concept is simple. Get a character who can use a maxed out intimidate while having the highest AC possible, very high saving throws and evasion.
Monks can get all that except they have to multiclass 1 level as fighter to get intimidate.
Monks though have some serious penalties. They are very restricted in weapon choice (especially if finess based), they can not use shields which seriously penalizes their DR available, they have very limited self healing (restricted to FoL and a meditation ability that costs 40 ki (useful in some solo instances but not great in a party or as emergency backup when fighting).
This build though works very well and covers almost all of the advantages the monk gets. You get SR...just not as strong as a monks....you get excellent saving throws and evasion (no improved evasion but a high enough reflex save that it doesn't matter), you get a higher AC then the monk, self healing, buff spells including full resists etc.
Here is the basic build:
Drow Paladin 12/monk 2/fighter 2 (alternative is paladin 11/monk 3/fighter 2 for fists of light but you lose DS damage that way).
Stats:
Str 10 (boosted up to 18-20 (depending on tome) eventually)
Dex 18
con 10 (toughness feats compensate for the low max hp...you get 4 extra feats 2 of which can be toughness)
int 12 (+2 tome lets you max UMD....+1 tome anyone can get for CE)
wis 14
Cha 14
Level up stats into dex.
First lvl should be monk for the extra skill points....make sure you put 2 into intimidate even at the first lvl so you can easily keep it maxed when yout ake your fighter levels.
Required feats:
Dodge, CE, Weapon Finess, Toughness (at least 1), improved crit piercing
Suggested feats:
Shield mastery, Improved shield mastery, Skill focus intimidate, additional toughness feat (minimum of 2).
Hp max reachers over 400 if you take 2 toughness feats or more along with maxing paladin toughness enhancement and lvl 1 monk turtle enhancement.
AC is the highest in game currently possible. It is superior to a pure monk halfling AC build by 3-4.
You do not even need a resist item/nightshield spell etc to reach saving throws high enough to not matter anymore (opens up more slots which you need for stats).
Very equipment dependant. You can use a rapier for extreme crit range (kurkri for slash).
DR is fairly decent as well (not optimal since you can't use a tower shield without loosing a ton of AC). The +6 to DR from shield masteries though adds up quickly...especially in combo with natural DR from robes till you get WDSR.
Full resists up constantly + extreme ac + decent DR + awesome saves + evasion + extreme crit range (15-20 norm...14-20 for smites), healing, immunities etc = nice useful character.
You can solo very well and are extremely useful in a party.