Evans is right up there with the top riders & with the field being so open as it is after the events of a couple days ago he may place near or at the top. Good luck to him & all the competitors!
I have a mix if 105, Ultegra & dura ace components. The rear derailuer (ultegra) has been flawless for me but i switched out the front 105 for a Dura Ace. Miles better!!! As for the Cosmics, I run Zipp 404's but My neighbor has the Cosmics. We both swear by our wheels
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As far as seats are concerend...I switched my Bontrager seat out for the Specialized Toupe'. I think it is the type of seat you are speaking of & I have been really happy with it.
THis is my ride...