Since the light weapon nerf i have been waring knuckles. I bought a pretty nice pair on the AH that only lowers my DPS by 1, but ups my crit for a total of 10%. I am level 16. I think this is important because now instead of having a base crit of 20% it is 7.5%. The extra 10% imo will help over a little DPS.

I not sure how the % totals are added though. For example do i add weapon crit + base crit + crit from dex?

That would mean 26.5% with nuckles as opposed to 16.5%.