if it was for non gaming, you don't even technically have to go that high, unless you're doing compute work or gaming. even a low end gpu can technically handle 3 screens on basic use.
My 5870 powers 3 high res screens, two @ 1920x1080 and one @ 2560x1440. If you just want to do Photoshop or something easy like that, you can do it with any Eyefinity card.