I'm in the Pacific NW (115" of pow in the last 7 days - don't hate boys!) and ride a few times a week all the way into late spring and place a season's pass on the same level as a regular haircut. Lots of good advice so far, but here are a few thoughts:
- You did really well on the basics, but a performance base layer setup is mandatory as its role it to wick the sweat away so your skin stay's dry and "dry = warm." Cotton is a lousy wicking material and offers zip on insulation when it gets wet. Poly works well, but will stink; wool works great and doesn't smell. I wear poly bottoms from Patagucci and a wool top from icebreaker. Just think of them as a good set of long underwear - you'll be able to use that plenty in NYC's winters.
- Goggles are the call for the hill; amber lenses for overcast and snow; mirrored or dark for sunshine. I know you wear glasses and am not sure if you will be wearing contacts, but I have some friends with specs who have gone mad over their glasses fogging under goggles. I saw someone recomended an RX pair, but that will be spendy and take time to get made. Smith makes a pair that have a small fan built in (runs on AAAs) and this seems to solve the problem. I saw a guy on the lift this AM this morning with a pair and we were talking about it - so it's top of mind...
- If you have contacts, then no problem. All of the big brands out there make good stuff - easy enough to find on sale.
- Insulation. This is a mandatory. As said earlier, layers are the way to go and Colorado can be COLD and if it's crowded then you can chill up waiting in the lift line. The amount you need will depend on how warm your body runs. I generally wear a wool zip neck and a Patagonia's R2 pullover and my shell and I am toasty once I get moving. Last week it was around 15 and blowing 60mph at times I wore a heavier fleece and then wound up adding a soft-shell vest. If you pick basic colors - black, navy, grey - this is stuff you can use in plenty of other parts of your life.
- I'd also suggest a simple fleece (or smart wool) neck gaiter over the scarf. Adds an extra layer around the neck, seals out drafts, can be pulled up in a breeze to cover your nose and face. Cheap...you can get one there.
- Socks should be wool (see base layer above). I have smart wool snowboard socks, but I think that thickness is really the issue to debate as my wife is skier and I'm always blown away by how thin her socks are.
- I'm sort of surprised by the helmet debate here as the number of folks I see without them these days is probably in the single digits. I used to joke that mine "stoked the illusion of fearlessness in the trees," but now the biggest risk I see are kids just bombing along with their iPods cranked up high and completely oblivious. Snowboarders can be the worst because of the backside blindspot.
Anyway, you can fill in the remaining gaps pretty easily - there's tons of sites with last year's colors at slashed prices - and much of this (aside from the helmet, goggles and the pants) can be used casually.
Have a great trip!