The GDM-F400 is just supposed to be really nice. But then you really pay for the privelege as well. The Nec has some good and some bad qualities. The best quality is color. Like Nokia's typically do, it has very good color saturation.
Graphics always look good.
Other good qualities, the screen is flat, and the body is short. Now for the bad qualities. I just don't thing the Hitachi and Mitsubishi tubes are in quite the same league. Or to put it another way, I'd put the Hitachi and Mitsubishi tubes in the same league, but a cut below the good trinitrons. They are not the default monitor they ship, so of course you have to pay extra.