I'd hold out for the 2dr. Specially if that is really what you are wanting. Now, with that said, if the 4dr is cheap, you might also purchase it for parts providied the windshield is good.
If you really want to buy a 2dr, there is one on eBay that is a fix-it but has all the parts to make a tbolt clone. Probably get it and all the parts for 10grand. Which I have that much in mine and it isn't even running yet. There is a thread here with the link to it.
I would go for it. the 4 doors and 2 doors are look very much alike, very hard to tell the different. I say buy it put a 600 hp 514 in it and make it a sleeper, that can take the whole family for a real ride