What did you guys pay for your DS 8.6?
I assume the silver DS 8.6 on Trek's website is 2016?
Brushed-aluminum is the old 8.6 2015 color, the new/current color is a metallic slate gray (Dnister Black). I've seen it listed as both 2015 and 2016 on various websites. I posted a bunch of pictures in the DS owners thread a couple weeks ago.
The only component difference I've noticed is that the pedals are black Wellgo M21's, not the red-alloy cage version pictured on Trek's website.
As for price, the 8.6 is going for $1200 in the Atlanta market, your market may differ.