Both look like nice solid cars.
The blue 3 speed car was recently sold by a board member in Oregon for $6200 to the guy in Philly. The new owner added the gauges, wheels, did a minor floor repair and installed new carpet. Considering shipping the car cost $1000, he's likely to have near $8000 into it, which is the current high bid. It's reported to be a solid, good running car with an old cheap paint job.
The Maroon car in Ca looks nice as well. There's a guy over on V8Buick (Mike) that is a real 65 GS fanatic.... he's likely to know the car, or maybe he even owned it at some point! As Rob pointed out, it does have the wrong air cleaner.
The post cars/sedan use different door panels and hence rear seat than the hardtop/sport coupe cars. I don't know offhand if repo seat covers are avail for the post cars.
Finding a car with a solid body and nice chrome will make the resto much easier.
GS's are rather difficult to clone since all body styles used the reinforced convertible frame. Other GS-specific items include rear axle, springs, brake parts, front sway bay, steering column, radiator, battery mount, and of course, the engine and transmission. A clone could be made, but it would take a complete GS parts car to do so!