I have the 2009 and it is a pretty sweet machine. Other than a refresh on the front facia, a few extra ponies and some other minor tweaks, they didn't do much between 08 and 09. You'll like the 800 for sure.
I have always owned yamaha or polaris (2 of each).
I would like to hear from the can am guys. I looked at them but will be picking up a polaris sportsmen 500 ho this week end because of the price difference.