Well, that is a pretty broad question. To get a good answer that will benefit you, you might want to add what type of riding you do. Elevation, terrain, riding style, etc. The more information you can give the better answer you are going to get.
Polaris has made some great sleds old and new. In the past couple years they have been some market innovators. There is a wealth of knowledge and experience on here. I'm sure once you have offered some more specific info you will get the info you are looking for.
Welcome to the forum.
'03 XC SP 600, 1.25" predator track w/96 studs, VForce3 reeds
'95 Indy XLT 600, plastic skis, skid plate, cobra windshield, XTRA 10, full Fox package, 1" riser