I would say the 600 HO. After racing my dad's 99 or 00 Mach 1 and beating him with my MXZ X 600 until about 80 mph. They are a very light sled, and the 03 600 have 8% more hp than the 02. I'm now sold on the 600s. They are fast, light, and can run with the big boys.
I'm not sure if the 800 is such a great buy because the Rev isn't a lake runner, in fact, it's the worst sled on the lakes that I drove. It is dangerously unstable over 100 mph, the front end lifts and the whole sled drifts on the left side and that was in perfect conditions (1 mile lake, no wind, completely flat surface with 1 " of packed snow) 5 persons that drove it that day at wot had the same thing happen. Having a lightweight front end does have disadvantages I guess. If you buy a 800 you can always gear it slower and add some torque
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