okay - basic fit is important, just needs to feel right, especially when controlling the bike in turning, balancing and wheel lifts/handling. as far as "light" mtb's go, i feel any hardtail will be close to as light as you can get on a mtb. dont fret about weight anyway, not really an issue as strength/flexibility of frame is more important. geometry - w/o being a loungeroom professor, steeper steerer tubes allow for more responsive handling, and you wont need anything that's too swept far backwards unless you're doing dh. what else... good warranty & service, go for better fork over disc and drivetrain.

i'd say you're shortlist is already pretty good. personal preference kona but that's more out of brand loyalty