Yeah, the JVC KW-HDR81BT is a good blend of features, and stealth for the application. I had one in my old 07, and it performed well with other equipment too. It steams music with great sound, gives enough RMS without an amp, and has multiple USB inputs.
The only thing it really lacks is the GPS, which I prefer not having. It's flashy for my taste, and I use my phone anyway -- and that streams directions over the music when I input a destination. In my opinion, there really isn't a need for GPS unless you are really off the beaten path. In that case, I bring my Delorme GPS with SPOT for emergencies. That way I can call for help -- something my in-dash wouldn't be able to do anyway.
Back to the fitment though...As @paraordinance said, it's the HU that meshes well with the kits. You get too fancy and you run into industrial design issues where form and function rub.