35% off, fair enough on going for the ACD but if its £400 vs £600 then I know Id definitely be going for the Dell.
The colours may need calibrating but most of the time all monitors need some sort of calibration, all of mine have needed some sort of calibration. The HC spec 2407 like I said does nto reproduce colours correctly whereas the non HC version that I currently own definitely looks a lot better for colour/brightness/contrast than my previous LCD's.
Have you looked at the Samsung 24" monitors? I remember my university had them and they looked fantastic but I cant remember what model!