What is more important is that you find a bicycle that fits you properly; otherwise, you won't ride it.
A comfortable bike with hi-ten steel frame, steel wheels and a one piece crank is preferable to a full carbon, Campy Record dream machine that feels like a torture device.

I would recommend you go to a nice bike shop that'll spend some time finding the right bike for you and your needs. And they make sure the bike fits you just right.