I would not recommend cheaping out so much on the mobo to get a 7970.
Especially not if you also cheaped out with the cpu.
What are your computer specs as they stand now?
Cpu: Amd Fx-8150 3.6 Ghz Processor
Ram: 4gb 1333Mhz Transcend (Planned to get another 4gb)
PSU: 600 Watts Cooler Master Thunder
Mobo: Gigabyte 78-Lmt-Usb3 ( Cheaper mobo with 2.0 Pci slot