i'm currently a thief class character. it's been pretty fun, and crit build is definitely the way to go there.
i've already done my limit breaking and am now on to going back to assassin, using the tower for my fast leveling up =).
real easy to do. i also have you added to my friend list, my character name is Frog in case you need that as well lol.
i will say though from what i've read on the gamefaqs forums that blacksmith class is broken bad. like it's uber good. but i'll play that one later. for now i'll just stick with other classes to have fun with. i've already gotten some interesting equips and cards from the tower, one Frione card, several GTB cards and quite unique equipment as well that is quite fun to use.
dual wielding +3 carving knives with a Frione Card in each
though i'll eventually get another frione card and put it in a jur that i've gotten to +3 just so i'll have a decent shot at maxing my crit =)
otherwise with the dual wielding knives i get like 400+ atk with around 30 str and 30 luk which puts my crit stat at like 30ish.
unfortunately i'm not far enough in the game yet to go past floor 30 in the tower, but hey, that's not all bad either.