First off, congratulations on your purchase!
I hope that our input eased your decision.

Second, there are many of us in the 6+ foot range (I'm 6'2"). It just takes a bit of practice to avoid the head-bonking. Figure after a week of regular driving you'll be good to go.
Just make sure that your hips go in the truck before your head goes in and you'll be fine.

As for relocating the rearview mirror, you can mess around with the adjustments to move it closer to the ceiling, some have even flipped it over completely (I did this for a time, but it interfered with my radar detector location).

I do find that I keep the VX's seat a bit further back and reclined more than I do in most other cars.