Bikes have come a very long way since the late 80's. Even low end modern bikes are far superior to old high end bikes. All components have improved, but primarily wheels and component groups have gotten vastly better. Modern frames are also lighter and much stiffer. You need to ask yourself whats your primary motivation. If you are just interested in riding then go with the modern bike. On the other hand, if nostalgia and/or a certain look is your overriding interest, then go with one of the vintage bikes.