To justify the cost of the 4870X2. You should get at least a 24" monitor. Anything lower then that and a single 4870 performs almost as well.
I am getting a 24" monitor, within a month or two.
As far as your recommended build, is the loss in graphics power really worth the cpu/mobo/ram upgrade? I mean is it worth loosing that much fps to be able to render or compress something a little quicker?
I have considered waiting for the GTX 295, but i dont have that much info about them. Do any of you know when they are expected and how much they will retail?