If you buy the Summit pass you get unlimited access to keystone, breck, and a-basin. If you get the colorado pass, you get the summit pass with 10 days of vail/BC w/certain dates blacked out. Usually the blacked out days are around xmas/ny/and presidents day. I know that sucks, but if you dont go those specific weekends your safe and if you do go those weekends, stay at breck. The summit is 399 the colorado is 459. Both come with 6 ski with a friend passes. A ski with a friend pass gets you your pass for a discounted rate. During the peak days its usually about a $15 savings (97-82), during the non peak days, the savings are more. Thus factoring only peak days, a Summit pass saves you $90. Thus if yo uand a friend go up twice and ski 3 days each time, you will save $90 from the six discounted passes and ski for 66.5 (399/6). Therefore you will save a total of $273 for a total expense of 891 vs 1164. It saves you ~25% assuming you use all of the buddy passes. Sooner, I believe the Ski with a buddy are priced at the half day ticket rate. Therefore during non peak days the passes are ~62-65, during the peak season they are 82. Im 90% sure on that but i will check.
[This message has been edited by nnichols (edited 1/28/2010 6:16p).]