Can anyone help??? I'm looking at a CAAD10/5 w/ 105's or a Marin Stelvio w/ Ultegra. I've rode both bikes and really enjoy the ride of the Marin but my concern is the size of the bike and the quality of the brand. I've only ever rode alloy frames so carbon is new to me and I like the way it feels. The Marin is a 56cm frame with a 55cm top tube and the CAAD is a 54cm frame with a 54.5cm top tube. On the Marin they put a shorter stem on the bike which brought the reach into specs but that was with my saddle all the way forward. I like the ride, the components, and the price of the Marin but slightly worried about the bike being bigger. Should I be concerned or just leave everything the way it is and buy it/ride it and stop worrying. For perspective, I'm coming from an undersized bike that I'm way too cramped on. Please help!!