What size tires should I buy for my NEW RBP rimsT905 black machined with

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black insert custom style forged rims? I just bought some sick RBP 20in rims, I already have Verde 20in rims on it that have Falken 275/55/15 size tires. Those tires are great and handle really really well and look good. But, these RBP rims are Tough looking rims and I need a tire with some muscle on it, such as Nitto's grappler series tires. Note- I dont want to spend 5-600 dollars a tire. The rims/tires will be going on a 2006 F-150 with a K&n cold-air intake, superchip, magnaflow duel exhaust with NO Lift Kit. So I dont want some huge tire thats going to take up my whole entire wheel well. I want a tire that looks mean that has good off-road capabilities such as the nitto tires I said earlier because they look great with lots of pickups with sweet rims on them. So I need a tire thats equivelent to the Falken tires I have. They can be just a tad bit bigger than the falken. I just want them to look mean with the RBP rims. http://www.carid.com/rbp-wheels/t905-91981.html this website link has tires on an f-150 with the rims that i have and i Love those tires!!....but i dont have the lift kit like thats ford. Thanks for the Help!