I've operated a Panasonic DVX100a for the past year, and absolutely love it. Sure those Sony cams will do HD (not true HD, mind you), but it still looks like video! No matter what the resolution of the camera is, you cannot escape this fact.
However, the DVX100a is beautiful. With it you can produce true 24p images, with very a very film-like gamma. The fully manual zoom and focus are incredibly useful as well- snap zooms and perfect focus can both be accomplished easily. In addition, the two built in XLR ports provide you with the option to expand your audio solutions without limiting you to consumer mics. It's a really sturdy and well built camera, and if I were cameraless with $5000, I'd buy it again.
With that said, there's a new DVX100b, which i assume has a few new features. My guess is it's basically the same camera with an additional "ooh" or "ahh", but i've never tried it and can't be sure.