i have been looking at some of the trek bikes. Specifically the madone 4.5 and 5.1 which are carbon fiber bikes. I have also looked at the cannondale caad-9 4, which is aluminum, but has slightly better components for the price. Some people argue that cannondale is the way to go, while others say that trek is the best. Should i go with the trek or the cannondale for about $2000?