You are already killing your desk space now with a 17" CRT. Any flat panel you get will give you so much more space than the CRT.
You have learned the dirty little secret of flat panel monitors; 19" monitors are the same as 17" monitors, but with bigger pixels. It is sad that this extends into the wide screen monitors as well, because a 19" wide is only 1440 x 900.
So, buy a 20" wide monitor. The Dell one does 1680 x 1050. I know it will take way less depth than the CRT, and I'm guessing that it will actually be smaller in all dimensions than the current monitor you have.