he is gonna need rims AND tires... say 4 15's for 400-450.. hes still gonna need tires.. so lets say he goes kumhos (which of course he would. lol) you are looking at 60 bucks a pop...thats 240so at least 650-700 plus mounting and balancing... i say stay away from rims and tires till you have like 800 sitting. cause that is about what it should cost for a good setup... lower it.. you will eventualy.. so it makes sense to do it now... while you have the cash..