Machiavelli said:
These options are, indeed, recipes for disaster. Don't try too hard to optimize them, because they are very fragile.
I disagree. I've played a Champion of Corellon Larethian before with a heavy focus on the Dex/Int to damage aspect. I threw in a little sneak attack to up the TWF damage potential and it turned out to be a very formidable finesse-based warrior (despite being an elf). Jack Dex and Int through the roof, keep enough Con to survive, dump Wis and Cha and have just enough Strength to carry gear.
Swashbuckler 3/Rog 3/Ftr 2/Shadow Thief of Amn 4/Champion of Corellon Larethian 4/Nightsong Enforcer 4
HD: 7D6 +9D10 +4D8 (~97 HP)
Feats: Persuasive (1), Weapon Finesse (swash 1), TWF (3), Improved Initiative (6), Mounted Combat (ftr 1), Dodge (ftr 2), Staggering Strike (9), Combat Expertise (SToA 2), EWP: Elven Thinblade (SToA 4), ITWF (12), Mobility (CoCL 1), Elusive Target (15), Karmic Strike (CoCL 4), Combat Reflexes (18)
+18 BAB, +6D6 sneak attack, evasion, uncanny dodge, Dex+Int to damage, and a decent skill list.
When TWF her Thinblades and flanking she is quite the devastating opponent. Elusive target protects her against those that attempt to take advantage of her Karmic Strike-lowered AC by Power Attacking. Staggering Stike is just a favorite of mine, it can easily be removed for something more potent, like Double Hit.
Either way...just my 2 cp