I think mount is included with the case, you would just have to buy riser separatelyThe grey will be ok mate as it's a darkish gery.
Out of all the cases I've had the evolv is by the far best for build quality and the fan filters do a great job at keeping out as much dust as possible.
My main gripe with the old one was intake and outake cooling but this has been sorted along with a he'll of a lot other things Inc hiding cables,I'm not to keep on the back glass panel as it serves no point to me.
The vertical gpu mount is nice as well as I will be buying that when it's available.