I just upgraded to a 19" monitor a week ago. At first the difference between my old 17" and the new 19" didn't seem very large, but when going into work the next day and using the old Compaq 17" I have there I could
really notice the difference. 17" now looks tiny in comparison

.
Consider the Micron 900MX, available at Best Buy for $379. It's a rebranded CTX PR960F, which is CTX's "professional" 19" monitor. It has a flat, FD Trinitron tube which -- according to the specs, at least, should support refresh rates even higher than Sony's G400.