BUILD IN 3.5 - talk with your DM about it
Hmm... eberron has a pair of feats that make some swords a special monk weapon. They work for longsword and two-bladed sword, though.
Feats: Weapon Focus, Weapon Specialization, Melee weapon Mastery, Improved critical and later (ECL 15, probably) Slashing Flurry. they are from PHB I and II.
With a pair of adjustments you can have not only a decent AC, but probably the best of your group: Two Weapon Defense tree, Combat expertise and monk bonuses + a little focus on AC (parrying weapons for start, ExPH) = a really good AC.
It probably won't help you, though, I'll go:
Monk 2/Swashbuckler 3/Ranger 2/Psychic Warrior 2/Fighter 4/Ranger +4/Fighter +2/Swashbuckler +1
with the Natural Warrior Ranger variant.
They are: Improved Unarmed Strike + 2 monk feats (UA variants can really help) + Weapon Finesse + Two Weapon Fighting + 2 Psychic Warrior feats + 3 Fighter feats + 1 Natural warrior Feat + Improved Two Weapon Fighting + 1 Fighter feat = 13 bonus feats (not the most possible, but a good Bab and feats are in a good selection).
And: evasion, AC bonus, unarmed damage, Insightful Strike, Chosen Enemy +4/+2, Animal Companion, Psionic Powers (quite nothing, but some have their uses), Grace +1.