As well as daggers, right? I didn't see a dagger expertise... I guess it's because daggers are thief-exclusive.
you don't need an expertise for daggers since you have the survivor skill assassin's kiss. at max lvl of 5, you'll do double damage once every two strikes (on the average). that's a big one, especially if you have a dagger with enhanced damage (savage, ruthless, merciless, etc.). the only drawback is that recup time for daggers is set at 5. if you can find one with enhanced damage & enhanced speed as well, then you can kiss every monster before sending them back to the depths of hell. <img src="/ubbthreads/images/graemlins/biggrin.gif" alt="" />
i have observed that gavanariel, the elven merchant in the dark forest, sells very good daggers (aside from bows). it's just a matter of reloading so you can get the mods you want.