My rogue/assassin is approaching level 12 and I'm pretty sure I want to make GS radiance weapon for the useful blinding effect. I'm just not sure what to make. I have taken Weapon Finesse because I like the flexibility and because I have some nice shortswords saved up; this would suggest perhaps going rapier. But the assassin line includes boosts specific to daggers and kukris. With a dagger I'd get 3x crit multiplier, better than a rapier, but the base damage is lower. A kukri would give me a wide range like a rapier, but it's a slashing weapon which is a problem for Improved Critical.
Any thoughts? I jump from class to class so I'll only be on this rogue for a few weeks unless I really love it. I do still have monk and ranger lives left as I slowly work towards Completionist, along with bard, FVS and druid -- would be nice if I could reuse this on one of them at least, but I don't know those classes well yet. Thanks!