I'm on the verge of the same decision, of ditching my CarPC. My Xenarc screen no longer works, and that was sort of the last straw.
I'm also interested in a running diary of your work 3onDubs, so I can see what I'm in for if I go this route.
So it's safe to say that there is not a double-din solution that doesn't require a vent hack? No Alpines coming that have screen separated from main unit?