Out of the two builds, in gaming performance, generally the two 7970 GHZ will perform better, as well as having better overclocking abilities. I would recommend the 7970 GHZ Crossfire, as it is the cheapest, and has the better gaming performance overall in my opinion. I would also recommend getting another two XL2420T's LATER to have best overall experience in games, as currently two 7970's is SUPREME overkill on a single 1080p monitor. Enjoy
You can always drop down the motherboard $100 to an Asrock Z77, drop the CPU cooler to a Hyper 212, and then also drop the SSD to get one more monitor, which would be pointless imo. With this build, and a preference of 1080p, you need at least 120hz. Otherwise you can easily go for 3 1080p 60hz monitors.
I was going to pick a 2560x1440, no doubt, but if you see under monitor resolution, he says he wants 1920x1080 or 1920x1200. I would've picked it if he wanted it, however a single 7970 is not going to do that well at 2560x1440 in future games, especially the upcoming Crysis 3.