I had to run my stock tires at 42PSI to get any barely reasonable performance out of them. I run my 185/55 R15's (that are on the DE now) between 36 and 38 PSI. 36 they don't hop bumps as much, but wash in hard cornering. 38 and they have some bounce to them, but are extremely solid in the corners.
http://www.tirerack.com/tires/tirete...jsp?techid=196
I found ICW Racing and many other brands with free shipping with a 5 second google search. They were priced around $100 each. I went with 15"x6.5". Tires 185/55. No rub with load or heavy maneuvers. Check my garage for pics.
234 Results on the below link for HPO offset 4x100 lug 15"
http://www.wheelfire.com/scontent/Wh...ize=15&isCar=1