Here's my set-up

Rims are American Racing Torq-Thrust
ARE-105MS7865B
ARE-105MS8965B

Dr Diff 1" relocation kit gives me about 1" clearance from tire to leaf spring on each side.

17x8 (4.5" BS) up frt - 17/225/50 (25.9") $95 each
18x9 (6" BS) in rear - 18/275/40 (26.7") $115 each

I looked at the 285's for the rear but it was almost $100 more per tire. I looked for common sizes to keep the cost down.