I bought an '85 Centurion Ironman for the trainer
It's been working great. I use a RockBros sweat net to keep sweat off the top tube, and I have a hand towel over the front wheel to keep it off the wheel and fork. Both work great. The Ironman, in near showroom condition, cost $85, the trainer, an excellent condition 1-Up, was $40. Picked up a couple Conti trainer tires for $10/each.