If you've got that many bars, knives might be a good option, I found them to be good xp at fire giants. If you want to pick your arrows up, I'd suggest training there. If not, you could buy a bone crossbow and bolts and go to the caged ogres (do Biohazard quest if you haven't yet) and you can probably get better xp there, with the occasional ranarr seed. The bone bolts cost 3 or 4 gp each and can hit reasonably high.