After about 3,500 miles on my 57cm Salsa Vaya Ti (2012), I can declare that this is the greatest bicycle that I have owned. To that end, I want to move from the current stock Sugino XD 600 triple and bar end shifters to a full SRAM 2X10 drivetrain. Looking for comments on: 1) what level of SRAM (X.5, X.7 crankApex, etc.), 2) 39/26 or 42/28 configuration, 3) rear cassette (I would really like to go to a 36 tooth granny, especially if I'm going to a 28 tooth small ring.
I've attached a photo of the bike, taken on the Going to the Sun Road in Glacier National Park last summer.
It's time for a remake, and I'm seeking your wisdom,