OK, I own the Eclipse AVN2454. It has been replaced in 2005 by the Eclipse AVN5435. Both are very nice units. I would not trade my AVN2454 for the world (well, maybe for the AVN5435). These are double-DIN units and the screen is always visible.

Another double-DIN unit would be the Kenwood Excelon DDX7015. I think there are a few guys on here that have this headunit and they seem to love them (SCxTerra and krzydmnd come to mind). I think they are very well designed.

I personally don't like the slide out screens. I feel they are a novelty and that novelty wears off in a few months. I much rather prefer the more "stock" look of an always visible screen. It's very clean with very few buttons along the sides. When researching for a DVD/Navi for my X, I looked at every option available, including the Pioneer units. For th money, I would go with either the Eclipse or Kenwood unit over the Pioneer. If you must have the novelty of a slide-out/tilt-up screen, then I would look at Alpine over Pioneer. The Kenwood and the Alpine require you to purchase the Navi unit separately. The Eclipse in an all-in-one unit with no components to hide. Everything is in 1 chassis.

Eclipse AVN5435:
http://www.eclipse-web.com/avn/index.html

Kenwood Excelon DDX7015:
http://www.crutchfield.com/S-VGpRZxHShpg/cgi-bin/ProdView.asp?g=62600&I=113DDX7015

Alpine IVA-D310:
http://www.crutchfield.com/S-VGpRZxHShpg/cgi-bin/ProdView.asp?g=62600&I=500IVAD310

My head unit:
http://www.cardomain.com/ride/630107/2