Monitor help please?

[fantasticCG]

Not sure which to go for

http://www.overclockers.co.uk/showproduct.php?prodid=MO-166-SA

http://www.overclockers.co.uk/showproduct.php?prodid=MO-047-DE&groupid=17&catid=1120&subcat=

or 3 Asus 23"

I have a gtx 680 and plan for a second one at some point

 

[fantasticCG]

Is the dell a 120hz monitor? does it really make a big difference?