As the title states, I am trying to create a three screen setup. Something like this:

[///////////]----------------------[///////////]
[///////////]----------------------[///////////]
[/////2/////][////////////////////][/////4/////]
[///////////][////////////////////][///////////]
[-----------][/////////1//////////][-----------]
[///////////][////////////////////][///////////]
[/////3/////][////////////////////][/////5/////]
[///////////]----------------------[///////////]
[///////////]----------------------[///////////]

I have read in this thread that mutiple GPU's cause a performance drop due to WoW only running on the primary video card.
A work around was stated involving switching the primary/secondary display every time you start wow up. I would like to avoid having to do that, every time I decide to close wow.
My plan was to use Vista with 2 ATI 4870 cards, the first one powering (1). The second card powering (2-5). Then I read about the fps drop when using multiple cards.

So. How would you go about achieving the above stated display using one computer ?