Yes there is a decent selection of sxs tires in 35x10-15, from fairly mild tread to full on stickies. I'd avoid the fuel brand tires, the itp coyote seems to be the irok of the sxs tires, do everything fine. My buddy just got the system 3 xcr350 for his rzr, they look almost like an at, but are a little more aggressive in person and have super soft tread blocks. I'm thinking about picking up a set for my Sami. I'm running 32 carnivores now, and have been super happy with them, especially in muddy terrain. They are also super durable, I ran them at Fordyce on a fat pig 4 door vitara full of camping gear with no issues.
Don't do an E-Locker, they suck. Honestly, I like the Spartans the best. I just bought my 3rd one. I think my toyota spartan worked more smoothly than the full Detroit I have in my front 60.