Quoted from Marc:
Sold my first XR-7 about 3 years ago for $6k. Current XR-7 will be around for awhile.
For a non XR-7 I would think $4k for a nice one and deduct for condition issues. To pull one from a collection that is not for sale, $5k+.
I totally agree with Marc. He has a good sense of market values.
The difficult part will be finding one that you can actually buy.
Btw Marc, it was nice to meet you in Houston.