My favourite build may not be exactly mainstream for a dex-build, but it's fun and saves you so much on food.
15:
STR 15
STA: 20
DEX: XX
INT: 15
Then until level 30 spam your sta and a little str if you feel you need it. ^w^ That gets you to about 50-60-ish sta. Then level 30-33 add only str, then 33+ keep going until 96 dex, when you get what I have a feeling is the last crit break and is a pretty decent speed anyway. I don't see huge points in going full-dex, because aggros won't like you.

And in the dungeons that suucks. You know... na...
Arek rings are <3.
The Entanale sword is a lifesaver at 30 because of your crappy str, when you've just lost beginner buffs and everything but your hp sucks. It has the attack power of a level 50 (correct me if I'm wrong) sword.

Upgrade it if possible- even though it might need repairs now and again they're cheap, and it looks awesome. Which is important. U_U;
-cough- Hope that helped...