So I've been looking for some older road bikes to turn into a single speed as a commuter bike.

I've been told that the Centurion Ironman Dave Scott is a great frame/bike, most that I find tend to be pretty pricey. But I have found some other Centurions for much cheaper that aren't the Ironman.

I was wondering how these compare to the Ironman. I'd like something nice, not too heavy...the lighter the better.

I'm open to suggestions of other makes of bikes.