There's no "blue book" for bike values. A CAAD 3 is going to be late '90's vintage in both cases. The road bike looks to be in nice condition with an owner that was too small for it. Those shifters need relocating on the bars - ie move up. If it's your size, and it looks like a 58cm which means you should be in the 6' area, then go for it. Those CAADs are stiff bikes, and a set of larger tires 25mm or 28mm will help with the ride.