7000? Do you mean the DVH-P7000 ? That unit is just an indash DVD player - no screen. The AVX-P7300DVD has a screen and a DVD player, and the AVX-7300 has screen but only plays CDs.
The AVH-P7490DVD is the latest with included Dolby Digital decoder and 6 amplified channels and uses the AVX-P7300DVD head unit. If you can find it for less than the MSRP of $2800, then it's a pretty good deal.
I looked at both 7300 units. The 7490DVD package was not in stores at the time. The Poineer units weren't bad, the colors were just not as sharp as the Clarion and Kenwood. Otherwise, the quality of the picture was very good. It could be how the stores had them setup, too.