They look like they're all Fords. For the bang for the buck, "I" would probably bring the best return. Looking at A, I can't tell if it's a late A Model or a B Model. My Dad's 1931 A Model pickup is in great shape, and I know I'll have to let it go at some point. The tough part about Model A's is that most folks interested in them want to cut them down for a street rod. That would be painful.
I really like "C", too. In high school in between my '65 and '66 Chevy II's, my Dad let me drive his '66 Ford SWB fleetside with a 351 in it. Boy, that thing would haul.
RTR,
Tim