update:
I've been driving around for a few days now, no problems when hitting big potholes or railroad tracks, the 3.5" HD is just fine so far. I wired my monitor directly to my powersupply so the 12V is regulated (and more stable). I also installed a nice microphone (have had it laying around for years) behind my steering wheel, and will be implementing voice recognition using Girder.
I also played with my GPS, huge WAF! I also tested the address book today since I was going to a restaurant, but didn't know the street name, so I did a simple search by name, selected it, and it automatically plotted the route. It also automatically updates the route if you take a wrong turn, and uses voice announcements to let you know when you have to take a turn (announces it several miles ahead, and several hundred feet as well). Really cool stuff!
Next step is setting up NetRemote and Girder, and try to get a working interface, but I have some other priorities right now, so that won't be happening for another few weeks.