Weight is always the most $$ part of a bike.
what is your budget?
disk brakes can add a couple of pounds of weight. IMO, they're a nice to have, but not a necessity (but will depend on the terrain)
a light hard tail is easier to create, FS mtb are much more expensive.
if you are trying to reduce weight on the wheels focus on the outside (ie rims and tires) before focusing on $$ hubs and the like. the outer circumference weight will make you slower. so you can spend a little bit extra on lighter tires and see quite a difference, or a lot on a hub and see little difference.
it really depends what your budget is in terms of what to spend some extra $ on to make your ride lighter.
smile
Han



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