This Z is near me, I asked for more pics and it really seems like it doesn't have much rust for a PA car:
The downside: It has a sunroof.
I think I can get it for a good price, but I don't think I want to deal with the sunroof. I'm willing to do repair work/welding myself, but I haven't done bodywork repair before so I'd rather keep my repairs simple or in less visible locations. I think putting a donor roof (if I can find one) is beyond the scope of my abilities.
But boy, does it look to be in good shape from the pictures! I haven't actually gone and seen it in person yet, because I'm not sure I can get past the sunroof...