double din lcd/dvd questions - anyone who's used one

[j]

im trying to decide between several of the double-din dvd/lcd head
units, namely the Kenwood ddx7015, Eclipse avn2454 and Rosen r6500 (if
there are any other good ones out there, please let me know)

anyone with experience with any of these, id greatly appreciate your
input here, specifically on these points:

1. Graphic EQ (does the rosen have one? how good is it on the kenwood
and eclipse?)

2. DVD Regions - any way to view dvds from other regions? any hacks
for any of these?

3. mp3 player navigation

4. anyway to change the background images or logos on any of these
either by settng or hack?

thanks!!!