When I was like 13 the cool bike to have whether it was road or MTB was a Cannondale.

I've been looking at some recently and remembering how much I always liked those late 80's and early 90's C'dale Road bikes with the big fat downtubes.

What should I look for (and look out for) if I'm considering one? the late 80's SR600 seems like a nice bike. Would I be smarter to spend a little more on a higher model? Are the later 3.0's any real improvement over an SR600?

It seems to me that once you get to a certain level in the lineup, the only real difference between models is the component group. Is that accurate?