Here some pointers. Know what size you want and how the geometry (eg, seat tube angle) affects the fit. Geometry varies among Italian bikes, and some have very steep angles, others relaxed and other middle of the road. Don't wed yourself to a specific make and model unless you don't care how much to spend. Well-known brands like De Rosa, Colnago and Pinarello command top dollar. You can often find lesser known brands of comparable quality (eg, Basso, Guerciotti, Gios, De Bernardi, Tomassini, Rossin etc.) for much less money. For example, I was able to buy a NOS De Bernardi for $400 for the frame and fork, and it is incredibly beautiful and well-made frame. No way I could have bought a comparable De Rosa, Pinarello, etc for that kind of money.