This is a fairly basic build I've played through a number of times (PvM, since I only play SP modules or multiplayer non-PvP campaigns as Neverwinter Connections). I like it for a number of reasons:
1) It's an elven rogue. That means keen senses, dual wielding light or medium weapons, and no size penalty for knockdown. But, it still avoids XP penalties, which can be a pain, especially in the types of games I play.
2) It uses a higher crit bladed weapon (rapier) normally, but can switch to a blunt weapon (mace) when needed (undead, constructs) and still be able to hit as effectively (more effectively even).
3) Gets Hide in Plain Sight, Epic Dodge, and Self Concealment V
So, without further ado:
Elf, any alignment STR 10 DEX 20 (32) CON 12 WIS 8 INT 14 CHA 8
AB with 2 mundane rapiers: 38/33/28/23 for main hand, 38/33 for off-hand AB with 2 mundane maces, or rapier/mace combo: 40/35/30/25 for main hand, 40/35 in offhand
Damage with mundane weapons: 1d6 + 6 + 10d6 sneak attack. Critical range for mundane rapier is 15-20, and critical range for mundane mace is 20 (NOTE: I specifically didn't bother with Improved Critical (mace) since the vast majority of enemies I come across which I would switch to maces for, like undead or constructs and such, are immune to critical hits anyway)
Saving throws (this is by hand, so hopefully I didn't mess it up) Fortitude - 21 Reflex - 31 Will - 15
Depending on how high the ACs get in the module/PW you are playing, you might want to switch to short swords instead of rapier. If you aren't going to get any more out of a 15-20 crit range as you would from a 17-20 one, you may as well dual-wield short swords for a smaller dual-wielding penalty.