I chose the Formula over the Extreme for the sexy-looking thermal armor and the Asus 780 because it matches the thermal armor quite well. I chose an 860W PSU because I might SLI the 780 in the future. However, this build isn't final because I'm waiting to see what the R290X brings to the table.
That's a monster machine you're building there. Yours is like mine's big brother. I also did the Asus/corsair black and red but I went the micro ATX path to save desk space (I live in Japan where everything needs to be micro )