I believe stock backspace is 3 1/4" but I cannot remember for sure. If you're interested in the moss minataur wheels, they're the same backspace as stock, so .5" more wheel sticks out. This can cause rear fender issues, so rolling or grinding may be necessary, depending on the size of your tire.
As to the Winner's Circle, in my experience, [Admin note: Its ok to say "I've had experience with a this vendor, PM me for details, but I'd prefer to not have these kinds of comments in the open forum. Nothing personal -- Basil]