I didn't like how the theif in this game couldn't really steal anything worthwhile- all i could find were phoenix Downs from some enemys, Gungir from Odin, and Protect Rings from King Behemoth's.

I liked Zidane in FF9s, where you could steal great weapons and armor from bosses, and ordinary steals where pretty great too. 2nd Place goes to Final Fantasy 6, with a similar system.

Anyway, cool as theifs look and are, i would, as Rengori suggested, say 'screw it'. Go for a differant job, there not all that great. Sorry.