The eclipse unties you named are both double din untis, one is 2004 model (AVN2454) and the 2005 model (AVN5435). Both have dual drives, the advantage with going with teh AVN5435 is that it has a higher voltage preout (5v vs. 2.7v) and that the software is updated.
On another note for differences between the two, i'd like to point out that the AVN2454 has the volume control on the passenger side of the unit. They did this becuase it was brought to the states pretty quickly from the japanese market and they didn't have time to change it. Kind of a wierd tidbit on it, lol.
Also the pioneer unit AVIC-D1 does not play DVDs at all.