Need a new main monitor

[SfnX]

Im looking at the best performing Monitor, im looking at either:
http://www.overclockers.co.uk/showproduct.php?prodid=MO-025-OK&groupid=17&catid=1120&subcat=

or

http://www.overclockers.co.uk/showproduct.php?prodid=MO-043-IY&groupid=17&catid=1120&subcat=

Im mainly looking for image quality and performance!At the Moment im using a syncmaster 2233bw but looking for dual monitor setup