I have this monitor. Be prepared to turn the brightness down to get good colors. It is by far the brightest monitor I've seen. At 100% it will tend to cause colors to look washed out. I think mine is around 30 -35%
Also there is a color profile available online.
Asus VG248QE Monitor Materials
http://www.tftcentral.co.uk/articles/icc_profiles.htm#install
http://windows.microsoft.com/en-US/windows-vista/Color-management-settings-frequently-asked-questions