Here are a couple of other sources I have been looking at for wheels (aluminum and otherwise). The second one even sells complete wheel and tire combinations.
Tires & Wheels: Low Cost Trailer Supplies
Trailer Parts and Acc. trailer couplers
I don't have any direct experience with either of these suppliers but I will have to buy all new wheels and tires when I get to that point in my remodel process so I would be very interested in more information as to exact products and sources for the wheels and tires people have chosen so that I can make a well informed choice when I get to that point.
So please keep the recommendations coming...