It looks good to me. Especially the crate

My rig is similar:
PSU Corsair HX1050
Mobo Asrock Extreme 6
CPU Celeron G530
GPU 3x Gigabytes WF3 7950
RAM 8G kit Kingston blue

Follow this optimizing guide if you buy Gigabyte 7950 GPUs:
https://bitcointalk.org/index.php?topic=197871.0

Good luck!