Sno-X-treme. You say you are now choosing between the Polaris 600 tripple and the 98 XCR 440, well i've had both and i absolutely love the 440. I've raced them side by side and the 440 (stock) easily beats my 600 and with my current gearing i top out just over 100mph. However, the (stock) 600 will catch up at high speeds and top out at 120 mph. This is on a smooth lake. Keep in mind that these are only my results, and is just for a reference. In my opinion if you want speed, go for the tripple. If you want to be the first one to make it through a very rough ditch or windy trails, then the agile 440 kicks. Both are fun sleds.
If you don't want a high maintenance machine, then stay away from the 440. The VES needs special attention to keep clean, plus this engine is notorious for a need to Keep-The-Pipe-Hot to get full power. It's a picky engine, but when tuned well, i can nearly keep up the 700's. The 440 weights 477 lbs. The 600 is 492 lbs from http://www.geocities.com/polaris-man/
Just my $.02 Hope it helps.