This is not directed at you specifically, but to the ST collective. This article should be required reading for all endurance athletes. Most of us are killing ourselves and not allowing our bodies to adapt to the training we do. http://www.sportsci.org/2009/ss.pdf
I have between 1 and 2 days of rest a week.
If I end up keeping my P2C for another year, I will have to look into a center pull front brake. The LBS that I have had a long relationship with sells Felt and Cervelo. I may pull the trigger on the upcoming Cervelo PX, P4 (dependent upon pricing), or Felt DA. I would expect the Felt DA to have similar aerodynamics to the P2C/P3C and behind the P4 so this would be more of an emotional choice - damn that bike is hot.
felt does do something, maybe it is the paint, that makes their bikes look hot.