I've been there, and am currently there, so I can speak from experience. My Torino Cobra was my daily driver for 15 years before I finally decided to retire it and restore. I did NOT do a frame off/rotisserie restoration since I didn't have the money and it was going to be a driver. This was 1994 and the $8000 paint and body work was a big spend for me. I probably spent another $5000 in parts and upgrades (shaker scoop, louvers, wheels/tires, door panels, etc.) I love the car, BUT... It's not the "original" Cobra, it's a "re-body". I wrapped the original around a tree. It's never given me the same feeling as the original. SO, do NOT buy a different GN, it just won't be the same.
I also have my '82 Mustang, which has been in the family since new. I just finished the interior, and got an estimate for paint and body - $6000. I talked to a local restoration shop, and got the impression that he would do it RIGHT for about twice that. Will I spend that much? I don't know. On the one hand, it's got lots of sentimental value. On the other hand, it's tired (235K miles), and needs more TLC than I'm prepared to give it. My original plan was to put it back into "respectable" condition and hand it down to my grandson. I'm still torn.
Bottom line. You will put more money into it than you plan, and you probably will never get your money back out of it. But, that's not why you're doing it. It's for the love and respect for the car and it's memories. Just do it!!
Gregg
2001 Proton Yellow #1379