B Body cars
I have a 69 and 70 GTX and I also have a 68 coronet wagon. I don't get as excited about them as I do my A-bodies.
A-bodies (Normal A-bodies 67-76) are really popular now. E and B had their crazes and they used to be worth crazy money but now a lot of the hype is gone.
B-bodies are a lot bigger than A's and that is where the A has the advantage. A-bodies also have a nice smooth ride.
B-bodies have a huge aftermarket following so parts are readily available.