i've attached some recommended equipment from some cali guides for winter summiting … never climbed in cali … but it cant be any worse than BC or the alberta rockies … lol
for winter mounteneering you really only have 3 realistic choices IMO
1. a full fledged leather single boot, not the lightweight ones … the advantage is that they are more flexible and technical … the disadvantage is that they take longer to dry and they are not as warm … most people find they fit better than plastics
the gold standard are the sportiva nepal evos .. i've used these down to -20 to 30 C … people also use them on higher moutains like rainier in the summer … more of a risk for winter mountaineering as there's less of a safety margin if you get caught, feels like a big hiking boot
note i would not use anything less than a nepal evo or its equivalent for single leather in winter … one that is designed for winter use … and only the with full gaiters
2. plastic double boot … heavier, stiffer, fit is harder to get right … but they are warmer, and most importantl for mutiday trips easy to dry … you just sleep with the liner
the standard for these are the scarpa invernos … IF they fit you great … you can buy them used and cheap … with better liners and overboot people have used them up to 5000m + … theyll handle any mountain in the americas … great for winter mountaineering, warm feet, but feels like clogs
3. double hybrid boot … never used these yet so i wont comment too much other than to say you're supposed to get the warmth of plastics but the better handling of leathers
sportiva spatniks and baruntse come to mind … id get these if you want to go a lot of high altitude and winter mounteneering, if you want warm really warm feet, and supposed better handling than plastic
MOST IMPORTANT … whatever you get you absolutely must try them out before hand for a good fit … personally i size all my winter boots with a liner sock and a super think mounteneering sock … do NOT accept any boot with any significant heel lift… also bring some kind of packs with you to simulate placing foot warmers in yr boots
make sure you get yr sock system dialed in as well BEFORE trying on boots
for crampons i recommend a solid 12 point crampon … they almost weight about the same as 10 point … the bonus is that they work better on steeper terrain and if you ever get into ice climbing they work well for that too … the standard are the BD sabretooth and grivel G12
i would definately buy/rent my boots/crampons from REI or somewhere that had an extremely liberal return policy … you may find that the boots dont cut it on the mountain … unless you find a killer deal somewhere else (just make sure you can return it or have at least tried it on alot)
in fact if you can i recommend renting them the first time out if they allow that for what you want …
some good links …
http://www.andy-kirkpatrick.com/articles/view/getting_the_right_mountain_boots
http://www.sierramountaincenter.com/pdfs/winter_mountaineering_course.pdf
http://www.swsmtns.com/equiplistpdfs/WinterExpEquipList10.pdf