So I've seen a couple people use knifemaster rogue... I've got a couple ideas for that.
Knifemaster rogue 4/fighter 6
Str:16(+1lvl4)Wis:12 Cha:8
Con:14 Int:10
Dex:20(+1lvl,+2H)
Defense; AC:26 HP:87 Fort:+11 Ref:+14 Will:+7
Feats:Dodge, toughness, TWF, Wpn Focus:Kukri, Pwr Attack, ITWF, Imp. Crit:Kukri, Point Blank & Precise shot(For versatility's sake)
Gear:2x+2 kukri, +1 composite longbow, cloak of resistance +3, ring of protection+3, +2 Mithral breastplate, belt of STR+2, DEX+2, couple grand in misc.
Special abilities: Sneak atk+2d8(knives), Finesse Rogue, Other rogue talent, weapon training(light blades)+1, Armor training 1
Atk:MH kukri +15/+10(1d4+6,15-20) OH +15/+10(1d4+4,15-20)
Add the Killer racial trait for a +2 damage on all crits and +2d8 SA dmg when flanking/surprising. Another direction would be to use daggers and get the +1 damage to daggers trait(River Rat I think) although you'll give up the higher crit chance of kukris. I son't know how to crunsh numbers well so if anyone wanted to calculate the DPR that'd be greeeat :P