Like Mule said, it all depends on what type of riding you plan on doing. Trails, backcountry/hill climbing, snowX
I wouldn't recommend a 4 stroke sled as they are VERY heavy and much more difficult to toss around through a group of trees. Each sled and model has their specific strengths and weaknesses. Skidoo's generally have clutch problems that can be fixed with some aftermarket modding, polaris RMK's chew through cranks like they're candy, and Arctic Cat M series have their problems with the diamond drives.
Education is paramount! You have to have it, snow will kill you. Take a class on avalanche safety and get the right avalanche gear; beacon, probe, shovel are your basic gear. An avalanche air bag is the best survival tool you can get, I highly recommend you get one and learn how to use it. Check out www.snowbigdeal.com
, they are the authority of avalanche safety equipment.
Edited by Rocklicker, 17 August 2012 - 04:34 AM.