I use a pair of MSR Evo Ascents and bring along 8" tails for unconsolidated powder combined with steep ups and downs. They're great, even though you have to get used to them looking a little beat up underneath from periodic contact with bare rock, but they work fine.
But I have a pair of these
Redfeathers that I initially bought for running, but ended up using them much more often than my MSRs. They're incredibly light, easy to stride in, have a great aggressive crampon, and the pointed tails really do act like a rudder on steep downhills. Especially for your weight (150 lbs) I think they'd do the trick in nearly all conditions. Only downside is that they have a hinge that is spring loaded, which is good in many ways, but it does kick some snow onto the backs of your legs. This never bothered me because I'm either wearing tights or some sort of winter pant that sheds this snow.
I'm wondering now how available these are, since the market is pretty dominated by Atlas, Tubbs, MSR, Cresecent Moon and LLBean. I was really unimpressed with all the Atlas and Tubbs I looked at. Crescent Moons looked interesting, but I never actually saw a real pair in a store anywhere so I was hesitant just mail ordering.
I like the basic strap bindings that are on both the MSR and the Redfeathers. These are highly customizable to a very wide range of shoes, from waterproof running shoes to heavy duty hiking boots. The more rigid and ratchett bindings seemed to have much more restrictions on boot fit.
Good luck!!