As with anything collectible, the rarest versions will bring the highest price. The rank and file hobby cars won't bring Barrett-Jackson money but will still keep some value. I still feel B-J has inflated values to the point where a weekender with a family could find himself priced out of the car of his dreams.
For a wayback machine comparison, my brother bought a decent condition '64 1/2 Mustang notchback (260 V8, 3 speed, generator instead of alternator) for $225.00 in 1976. Good paint, good interior, everything worked but it needed brakes. It was just an old car at that time. Since they were 'just old cars' many of them went to the crusher etc so now the value has gone up, I would have to say a solid driver like that would probably bring around $4-5k now.
Or a 4 door '57 Chevy; nowhere near the value of a 2 door, a 'vert or a Nomad but it would still be higher than in the mid 1970's when a bud bought a daily driver 6 banger 3 on the tree '56 4 door for $50.00.
No, the vast majority of the cars we see now won't put your kid through college in 2030 but they will be worth SOMETHING just for the rarity.
