Well id think you should be able to find something decent. I have a 69 Sport Sat convert. The car is a what id say a very nice driver, excellent body, great paint/chrome/trim. The thing is the parts if missing or in bad shape are expensive. The big parts are the grille, trunk finish panel, rear interior panels, rear seat. Those body trim parts are the same as the GTX. Crusinin moons I saw was making rear interior panels for about 700 which is a great price.
Personally I think a complete satellite convertible might be a good choice as against a RR or GTX, or even S.S. in poor shape and missing parts.
The numbers add up especially if you buy a incomplete car.
I have rebuilt, restored or replaced literally ever part on my car. I am presently installing a 8. 3/4 sure grip that I had completely redone. That will pretty much finish the car, if you ever really finish it.
I saw what you bought for seven grand (and BTW happy it all worked out for you) so I guess you have a idea what prices can go for, again try and get a complete together car, my opinion and best of luck