D&D 3.5 Rogue Leveling Plan?

As an experienced gamer, but brand new to D&D itself, I just want to make sure I'm not missing something important in my levelling plans for my rogue. Not really worrying about sketching in a secondary class at the moment (though it likely will be Wizard with mostly non-combat spells in Transmutation, Illusion, and Divination).

Elf Rogue

Str: 13

Dex: 20

Con: 13

Int: 14

Wis: 12

Cha: 8

(Yes, I did roll ridiculously well overall)

Primary weaponry: Daggers (dual-wielding at level 3)

Feats and Skill:

lvl1: Weapon Finesse

lvl3: 2-Weapon Fighting

lvl6: Imp 2-Weapon Fighting

lvl9: Blind Fighting

lvl10: Crippling Strike

lvl12: Imp Crit

lvl13: Skill Mastery

lvl15: Grtr 2-Weapon Fighting

lvl16: Opportunist

lvl18: ???

lvl19: ???

As I have it figured, I'll have in most cases 7 attacks and Sneak Attack lvl 8 at XP level 15, which should put out some ridiculous amounts of damage on anything Sneak Attack can apply to.

I had been thinking of picking up Improved Evasion, but I read somewhere that it was practically useless, as you shouldn't be failing Reflex Saves much at all by the point you can pick it up anyway. Defensive Roll looks powerful when it comes into play, but is extremely limited in usability.

Any suggestions?