I don't think I can ride just one. I have one that I ride more than others. My Serotta Atlanta gets the most miles. I can't say enough good things about it. There is a weight penalty when I take it out with the carbon crowd but no matter. If I get on the CAAD 10 after the Serotta there is the instant acceleration the stiffness provides but it can also feel like riding a log compared to nice steel.

I have toyed with rigid frame mountain bikes with quality steel frames and riding a sport tourer Trek 412. Had a Trek 620 but also but going pedal to the metal is what I like.