If you truly want a trail sled, then my recommendation is to hold off and keep looking for a short track.
A Mnt Viper has a 38.5" ski stance for side-hilling ease, makes it a lot more "tippy" in the corners. It also doesn't have a sway bar. The longer track will make it want to push through corners: when you nail the gas with that much track, it simply wants to launch the skis and go in a straight line. You also will have 40-21 gearing, which results in about 85 mph top speed. You'll have to play with gearing and clutching to find a happy medium for top speed vs still having the torque to turn that much track.
I'm not saying it can't be competitive out on the trails, but you'll have to make several changes and even then work twice as hard to go through twisties as fast as people riding short tracks.
Just my .02 cents. Don't want you to be disappointed out on the trail trying to run with buddies that have short tracks.