Well... I'd get the first, but that's just cause I'm anti-AMD... Just because.
Although it looks like the second one includes win 7 and the first doesn't. If that's the case, I'd make it a coin toss. An OS copy is a very valuable thing to have at times, and you can reuse it as many times as your license allows.
So, assuming that the first doesn't include the OS and the second does, I'd prolly get the second one, save for a bit, and then do more upgrades.
Also...
Computer 2.
AMD fx4100 processor @ 3,6GHZ
16gb DDR3 ram @ 1600MHz (corsair)
Asus HD 6950 graphicscard @ gb minne
Gigabyte , sli/crossfire
2000gb 7200rpm
Samsung 840 pro 128gb ssd
HAF 912 Case
Corsair GS 600w nätagg
Corsair H100 watercooler
Windows 7
Is that supposed to mean that the mobo supposrt sli/crossfire, or that it come with a crossfire setup already in place? Caus that's a game changer too.