My son wants x3 screens for crimbo and i need some advice please.

He has a asus P5K p35 mobo
http://www.neoseeker.com/Articles/Ha...igabyte/5.html

OCZ 4GB (2x2GB) DDR2 800Mhz/PC2-6400 GOLD XTC Memory Kit CL5(5-5-5-18)

asus gtx 460 top 768mb oc

Quad core 9450

I was gonna add another gtx 460 but the mobo wont support sli so i am looking at eyefinty with something like a 6970 or a first release 6950 that can be flashed to a 6970?

I was thinking of x3 of these but have now read something about the middle one has to be or have display port which i don't understand tbh?
What cables do i need etc.

Looking at these monitors.... http://www.ebay.co.uk/itm/1405881352...fvi%3D1&_rdc=1

Anyone have a x3 display for gaming that can give me some advice?