Welcome! I have a 64 vetted myself but my real love is Mopars. I have a couple 70 Challengers but someday I'd like a 70 or 71 Cuda as well. I would think you could find some really nice 70 versions out there starting in the 30k range and going up from there depending on condition, numbers matching, options, etc. Add a bit more for 71 cars but they are out there.
One thing I do when I have my eye on something new is just google image the car I am interested in and you get to see hundreds of photos from all angles and in all colors. You also start picking up see subtle differences and how they look with different options like stripes, wings, hoods.
I narrowed my dream car to a 71 Cuda 340 four speed in Sassy Grass green with a black vinyl top, black interior, and black billboards. I'm only a couple years out from hunting that car down.