If i were you, I would save more money and buy bigger wheels, 15's or 16's at least. I had 15" wheels and went to 17's and they are a whole different world of handling. Besides, they look way better.
You should be able to find different wheels in any size at
www.tirerack.com www.whalentire.com or
www.tires.com Actually, I bought my 17's off of ebay and got an excellent deal on them. If you know what to look for you should be able to get a good deal.