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Mikepage I think you really want to change the wheels because you want something lighter, but can't find them due to high cost. I recently bought used Advan wheel/tire on ebay. I was able to negotiate with the seller and I got a good price out of it. If you're really going after "Performance", follow what CGS David suggested. If you're looking to change the appearance, save up some more cash and get the style you want + tires that were suggested. Good luck!!
oh, and the ebay seller was in Quebec. Look for Japan Imported parts. Lots of JDM goodies.