I have been a die hard Shimano fan for as long as I have ridden bikes. That said my new race bike, a Caad 10 with SRAM Force/Red, changed my mind in a few rides. Yes it does take a bit of getting use to, but once you do it is so much more natural to use than my Shimano, in fact I have more trouble going back to my Shimano than I did going from the Shimano to the SRAM. There were just to many more features that SRAM offered that benefited my style of racing to NOT go SRAM (lighter weight, quicker shifting, shifting that works better during a sprint, etc.), I can literally see SRAM being the difference between winning a race and not winning.
With regard to what bike, the EVO is their signature bike, so if money is not a factor the EVO is the obvious choice. However if it is the SuperSix with a power meter or the EVO without, I would pick the SuperSix all day. If you race, I think you will need to add a PM to the EVO just to get it up to weight, all of the ones I have seen are well in the 14lb range with everything on them.....