The MPD is pretty cool. I use it with Serato for cue points, loops, effects etc.
I just sold my MPC 2000xl a few weeks ago and I really miss it. I replaced it with a MPC 1000 but its not the same...
I've always thought about the 2000 because it was the standard for so long too but it would seem like the 1000 is better geared to integrate with your computer for easier file editing.
I almost bought an MPC but bought a controller 1 instead. Then I almost bought an MPC last year but bought a red Donkey Kong instead. I stand by my decisions.