My brother had the same problem when he got his reva 12" pb, only VGA... there is an option to turn vga into DVI or ADC... I think its from Dr Bott
whatever monitor you want to use, use a good calibrator to set it up properly, I did it with my 2 CRT's (Gretag Macbeth's EYE ONE) and even if you don't get them 100% it's allways better than Factory Settings
from what I've heared flatscreens give a little harder contrast than you will eventually get on print, but the colors can be adjusted for good results.
if you want a good flatscreen with VGA option (and DVI for later use when you upgrade to a new mac in a few years...) and that is good for colors: LaCie has their 19" & 20" ok its not cheap but they're good!
J