You're human and you want sneak attack. Which and how many rogue skills do you want maxxed? For maximum sneak attack goodness: Invisible Blade. You have all the prerequisites anyhow (Bluff 8, SenMot 6, Weapon Finesse, Weapon Focus (dagger)). What about rog5/ftr2/InBla5/temp3. You'll have 6d6 sneak attack damage, a free action feint for every attack with take 10, AC +6 (+7 if you get an Int +2 item) and a higher BAB.
We might add in two levels Master Thrower too if the feats allow and you'd have Imp Evasion with nearly full BAB progression.
Feats needed: Weapon Finesse, Weapon Focus (dagger), Dodge, ITWF, Mobility, Spring Attack, TWF.
Feats we have: 9 (1 human, 6 levels, 2 fighter). Means we might take 3 levels Swashbuckler instead of the fighter levels to get Insightful Strike. We lose one feat though and one precious Tempest level. I wouldn't do this.
Rog1: Sneak attack +1d6, trapfinding, Weapon Finesse, Weapon Focus (dagger)
Rog1/Ftr1: Bonus feat (TWF)
Rog2/Ftr1: Evasion, Feat (Dodge)
Rog2/Ftr2: Bonus feat (Mobility)
Rog3/Ftr2: TS +1, SA +2d6, fulfill InBla skill requirements
...
Rog3/Ftr2/InBla5: SA +5d6, feint mastery, feint as free action, Int bonus to AC when wearing no armor (max 5), bleeding wound, 2 feats (Spring Attack, ITWF)
The next two levels rogue give you 26 skill points to maxx out the Disable Device, Open Lock and the Search skills. That's more than enough... most other skills can be increased already with the InBla levels.
Afterwards: 3 Tempest levels with +2 AC (unnamed) and only -1 for TWF. Sadly with two daggers we can't use one nice Tempest ability... Two feats for leveling: GTWF and one other, perhaps Imp Critical.
Ability increases: At least 1 for dex (one needed for GTWF), perhaps the first two for Int (and AC +1) for more skill points at the level 11 and 12 rogue.
Your attacks: +13/+13/+8/+8/+3/+3 (BAB, TWF, ITWF, GTWF) + 4 (Dex) + 1 Weapon Focus, -1 TWF.
So this build has +1d6 more sneak attack, better attack, much better AC and "free" sneak attacks even without flanking. And hopefully enough skill points as well.
Edit: Movement. Don't forget that you need some movement booster without Dervish levels. Boots of Springing and Striding should suffice to get a good use of your Spring Attack after two more Tempest levels... and get some good bracers of armor
