If you are looking for a cheap upgrade, grab a set off Grippers of ebay. I think I paid 140 for a used pair that were in good shape, and so far I like them a lot better than the stock skis.
I went with SLP Mohawks on my 2015 Viper and they are awesome. Wider and more flexible = flotation & feel, deep keel eliminates on trail darting. Well worth the investment.