After abandoning Apple's products in favour of Windows 7 and Linux Mint I haven't managed to find a really good display to match the visual quality of the iMac 24"/27" screens.
I have a Dell Studio XPS 17" notebook with the stunning RGB LED screen. It's a bit of a letdown when I plug it into my Samsung 23" 1920 x 1080 display.
If I have to I'll go for the Dell U2410 24" W or the U2711 27" W UltraSharp Monitor but if I could find something as good or close to it but less expensive it would be a plus. I'm retired and need to watch my pennies.