Prob catch flak from the uneducated yuppies, but I say run retreads. Treadwright.com . The guard dog is an exact copy of the mtr, way cheap, and get GREAT reviews on all the wheeling sites. Pirate, ttora, Ih8mud, and even here on marlin.
You can get em all the way from a 31 to a 37 if you got the right rims. You can get stuff added to them to improve life or offroad handling.
You can call them, and specify the casing you want, even get old mtr casings if they have them in stock.
Wheeling is one of the cheapest backyard hobbies I know of. Myself, and many others have built pretty nice rigs, for pennies on the dollar. Thats why I thought we all drove toyotas? Because it DOESNT take money to make one capable or a reliable nice dd, like the bolt on money hungry jeepers