The 997DF DOES have much better refresh rates than the 955DF. On the 997DF, you can run 1600x1200 @ 75Hz easily. It isn't expensive either, because Best Buy has it for $199.99 with a $20 rebate. I saw it there, running their demo and it looked excellent.
If you were to choose between the two, choose the newer 997DF. It also had a TCO '03 Sticker on it! :shocked:
I don't know about MagicBright so much. I know the 957MB is highly thought of by PC World and others, but I saw the 17" version next to the 997DF and I really couldn't see what the difference was. I would like to point out that the 900NF is no longer available, and hasn't been for some time.