troweller............. I have had the same dilemma. While I initially thought the 09 carry-over 800 Everest was the best choice, after punching in some numbers and doing some more digging I am going with the 2010 800 summit X's for my wife and myself. With the snowcheck X you already get the upgraded shocks and modul. They have changed the "handling package" which is suppose to help with sidehilling/ease of roll up (smaller diameter swaybar,reshaped rails, longer center shock, new rocker arm etc.) which was one of my main concerns. They have also raised and narrowed the seats this year, which was also a deciding factor. There is an article in the last snowest magazine about the 2010 sleds and all the changes. I doubt you can go wrong with either decision, but the changes were enough to push me towards the 2010.