Ross
I use the following 24in LCD for HD work:
BenQ FP241W (http://benq.co.uk/products/LCD/?product=636)
Has just about every input you'd want
I have 2 on my desk that get used constantly. Not the best for touring - but fine otherwise.
However, the BenQ G2400WD is a good 24in LCD at a sensible price. It has DVI/VGA/HDMI and does 50Hz too. Its also a good size and design to fit in a flightcase easily (better than FP241W)
http://benq.co.uk/products/LCD/?product=987
Theres also a Dell 24in out there that is similar spec to the FP241W and is usually compared in many reviews against the FP241W - I think its slightly more expensive and slightly less features.
The BenQ G2400WD seems good value. Not as good colour quality as a mac monitor - but then its about a third of the price...
The 24in above both do HD, have 1:1 options and run up to 1920x1200@60Hz
Haven't found any 22in that do 1920x1200 - don't think there were any around until recently? Most seem to stop at 1620x1050...
Give us a call if you want to check them out
Simon