i agree with what's been said. you've got to dig a little for specific info.

as an owner of two White Industries titanium BBs. i'd say they are pretty light. of course that's not exactly an industry standard metric.

i happen to like the minimalistic design. on old fashioned spindle, sans races, two cartridge bearings, two aluminum retainer cups and an aluminum lockring. they don't offer them in a lot of different lengths...

OTOH, a new build just got a shimano un72 that i bought for a song a while ago from Jensonusa.