As I understand it the most important factor for helmates is the fit. Just go to ski shop and try a few on till you find one that fits. Also weight is a scondary consideration. You don't want to be carying arround a something heavy and tiring your neck.
I know alot of helms have supposed features like tons of venting, special addons, radios, cel phones, etc... Those are mostly junk IMO, its hard enough to hear as it is witha helmate on with out earphones, radio etc... As for venting: I have a helmate with very little ventilation. I have used is so far this season on very warm days (up to 45F) and on very cold days down to 13F. I have always been totlaly comfortable with the helm. I sweat a lot in general; however I never once remeber sweating much in this one, even when I am really working hard. Linkage for a pic of what I am talking about.
Helms can be expensive, and since it is a safty item I don't think that anyone should have to choose between safty and buying their next lift pass. Some of the more expensive hems go for $120+ retial. If you want to be a cheap skate / don't have much money you can get much better prices on ebay. Like 50% off on the more expensive helms. But if you do go to a store and try on helms you might want to consider buying from them as an ethical matter; inventory isn't free.
As for goggles, yellow lenses are for stormy days, flat light, or low light conditions. Rose, amber, persimon are good for general purpose. Get a flash coating for bright days. I think basicly two pairs of goggles one yellow and one amber flash lense is all anyone really needs. Maybe clear if you do night skiing. Just go for whatever fits. Make sure you try the helm and goggles on togheter to make sure they fit comfortably and don't let air blow into the corner of your eye. I usually get cheaper goggles (arrond $40) all my goggles have lasted 3+ seasons and I have never had any problems with fogging, even at liberty this week in the clouds and 45F rain storm. As for brands, I have one Smith and one Zeal pair.