I've had enough of this wheel/tire nonsense!

Here's Mikesduster looking tough sporting some 15x8's on the back.
http://www.scottysplace.net/Gallery/MikeWilcoxs72Duster.asp
You'll probably want something a little wider for the front if it's just for street driving. He could probably tell ya how the rears fit, also the backspacing etc, he's also a member here.
I'd stick with 60's in the front and either 50's or 60's in the rear, just get the offset right. I think the Dusters look good with a little smaller tire in the front it gives it a nice muscle car rake.
Good luck and take your time so you get the look you want.