I've always owned mountain bikes and recently got into Cyclocross. Picked up a 2011 Trek XO1 for the upcoming cross season a few weeks ago. Been riding a lot on streets due to trail conditions after rain.

I'm also training for the Tour de Cure ride coming up in June. I'm going to do the Century on my cross bike (adding road slick tires).

I decided that I want to pick up a road bike now and start seriously getting into the sport. I was looking at the Trek Madone 4.7 and now I've started looking at the Madone 5.1 and 5.2. Originally, I wanted to stay around the $2,000-$2,500 range. However, I'm not married to that range.

Does anybody have experience with any of these bikes? I'm already used to the SRAM doubletap system so I'm leaning towards the 5.1. However, I could easily get used to the Shimano system. Would you suggest a different bike over the Trek?