I thought red labels, or .190's were the thickest? Only thing stronger is suppost to be the rolled edge rims, ones with the reinforcement ring, or beadlocks.
I'd go with a set of beadlocks and with 18" mx klaws or 18-19" Holeshots.
Oh and hipers usually run in the 350 dollar range for rears alone from what I've seen. They just went up on their price.