I have a P6400 and it's just a basic deck. No MP3's, no separate sub out. 2V preouts. It's OK, but I dunno if it's a step up from what you have.
My son has a Sony deck and it skips a lot. And the volume control goes intermittant sometimes, randomly going to full volume. Not the model you were looking at though.
1999 Buick Park Ave Ultra
Head Unit: JVC KWHDR720
EQ: Audiocontrol EQL
Front Stage: Hybrid Audio Technologies Imagine 5.25 mids, Morel Maximo tweets
Sub Stage: Boston G3 10", 0.5 cu ft sealed
Amp: PPI Phantom 900.4
Rear Fill: Boston SE953 6X9's