I was going to help you out until I saw the wisecrack about green cars!
I'm the proud new owner of a 1970 RAIV 4 sp, 4.33 GTO. Right now it's black on black, but it was originally PEPPER GREEN and that's what it's going to be again when it't repainted!
Allright...if you're looking for a 70 GTO, they're all over E-bay, and you should also check performanceyears.com and classicalpontiac.com. Of course, the green cars are usually faster than the rest of the herd, but to each his own...
You also may want to post more details (i.e., price range, options, etc) on what you're looking for; "nice" and "not green" is a pretty big range.
Good luck,
Scott