That's a real nice setup Dave!
Very inviting!
I did something similar. I have 2 dual monitors in front of me at my work station, and a 37" HDTV that doubles as a 3rd monitor.
I use it for dragging some VSTs & other things out of the way to, [but still visible], and I additionally use it to drag my main tracking window over to, when sitting at the piano which is right next to it, as I cannot see the 2 other monitors from there very well.
I found that an additional graphics card was the way to go too, but it also required 2 spaces for the heat-sink as well.
Having an ASUS MoBo, I decided to go for an ASUS GT 550 [or something like that - memory challenge from a year ago] for about $79. Well worth the money.
Looks like you're all set to go there! +1