there are 2 kinds of 8 bit panels, i called dell and they confirmed it that 1907 was a 8 bit panel. (search dell community forums for the reviews and discussions), but does 1907 have all the colors that a true 8 bit panel gives u. that is the question!!
i have the 1907 now. the only problem with it just as about all the lcds in the price range is that lcds usually have a max refresh rate of about 75hz.
in the case of 1907, the max u can go upto is 1280x1024 at 75hz, which means that your crossfire ati 1900xtx setup or your quad sli 7900gtx means squat, nomatter what highend videocard you have , you can only get a max frame rate of 75 fps at max resolution of 1280x1024.
this works for me just fine though.
x1900xt, 2.8ghz dual core, 1gb ram, 160gb 7200rpm, 2 DL DVDRW
Edit:
my bad, i meant that 1907 has 16.7 million colors like a 8 bit panel, but dell will not confirm or deny that it is a 8 bit panel.