Since I won't have as much time to play as I used to have, I'll spit a build idea I had after seeing park's bg/monk
Starting ability points: 14/16/10/8/14/14 or 14/18/8/8/14/14
Leveling:
Starts with 8 rogue, 10 BG, 2 rogue
Epic Levels, get 1 SD, then 15 BG, 3 Rogue, and the last lvl go for BG
-Pre-epic feats(7):
Power Attack
Cleave
Weapon Finesse
Blind Fight
Weapon Focus (Rapier)
Dodge
Mobility
-Epic Feats(7):
Improved Critical (Rapier)
Divine Might
Divine Shield
Epic Skill Focus Hide
Epic Skill Focus MS
Blinding Speed
(?)Improved Initiative
-BG bonus feats:(5)
Epic Weapon Focus(Rapier)
Epic Prowess
Armor Skin
Epic Servant
(?) Improved Sneak Attack
-Rogue Bonus feats
Crippling Strike (or Improved Evasion)
(?)Opportunist (Or Defensive Roll for epic dodge)
Main idea here was to make a rogue with crippling strike, because I always loved that roguish feat but never really managed to think of something interesting with it. If you find it worthless just trade the 2 extra rogue feats for Defensive Roll & Improved Evasion for the always-lovely Epic Dodge
Ab is 56 (27(bab)+15(dex)+5(weapon)+4(feats)+5(ab from bulls strength)), with hips u'll get a decent hit-ratio with 7 attacks/round while hasted with 16d6 sneak attack damage.
If epic servant with 26 bg levls is good enough to tank, you can send him ahead to attarct so u can freely get sneak attacks on the mobs sawrming him.
Edit: Put up Rade's leveling correction & starting ability points