I use Symtecs on mine. Been on there for a few years now. I used a marine style water resistant toggle for the switches instead of cheep ones that come with them.
Yamaha makes a nice kit. Called "hotgrips" they are hard plastic and get really warm. Mine came on the quad when I bought it (05 Grizzly) and they still work great. I use it year round to play and plow snow. Bought a set for my Wife's Kodiak, they were about $40.