I chose the Premier DEH-P9400MP for my own personal system, with the wait-time between MP3 tracks in mind.
Overall, on a scale of 1-4 stars, I rate this deck a 5. I bought it when they had been on the market 2 weeks, so it was quite expensive ($675 for me, direct from the distributor, which was about $795-$895 retail).
The slight delay between loading MP3's is the only negative thing I could possibly think of to mention about this deck. If anything happened to it, I would certainly want another one.
It offers control over every aspect of the sound that I could think of (and I can think of a LOT), which was the major selling point for me. I have never regretted making the selection, and I am very picky.