Which Mountain Sled?

I currently have a 2007 Polaris Switchback 600 CFI 144 in track that scored both pistons and took out one cylinder this past season. I live in North Dakota. All of my friends head out west to ride. I would like to go with next year, but I doubt that I will be able to make more than 2 trips a year. I have been debating on getting a mountain sled, but I still want to ride around here as well. The Liberty 800 engine makes me nervous as Polaris has not come out with a definitive fix. My friend has an 2008 M8 sno pro that he loves, but he says it sucks for riding around this area. The 2010 M8s look sweet, but it is the first year with a high output engine...so I am leary of AC as well. I think I could put a deeper lug track on my current sled, but I am not sure what that entails or if I have to purchase additional parts besides a track. Any suggestions? Anyone from ND or MN that has either RMK or M8 that rides around here as well?

Thanks for the reply! I am currently looking at a 2009 M8 sno pro 153 with 235 miles on it. Dealer says it is in new condition...stored in an enclosed trailer. Warranty until December 2010. Dealer wants $8800 firm. I am wondering if this is a decent price...I know people have purchased new for $9400. Any thoughts...

Thanks for all your great replies! I ended up picking up a used 09 RMK 700. I think that I will be very happy with my choice.

Now all I have to do is sell the switchback!