Odds are you will like the ride of pretty much any De Rosa. I have a 1986 Pro, SLX frame. It rides great: stiff but not too stiff to take pn long rides on less-than-perfect roads; responsive but not twitchy; smooth but not whippy. Just about every comment from Forums members talking about their De Rosa says something similar to this.
So get one. You won't be disappointed. And even if you are, you should be able to sell it and get most or all of your purchase price back.
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"I'm in shape -- round is a shape." Andy Rooney