Time for an upgrade on a three year old rig

[fitycents]

My current PC rig is now three years old and with Battlefront coming out soon it is time for an upgrade. With my current set-up what would be the best bang for my buck to upgrade? Or what should I prioritize? Thanks!

Corsair Carbide Series 400R Mid-Tower Gaming Case
Intel(R) Core™ i7-3770K 3.50 GHz 8MB Intel Smart Cache LGA1155
Cooler Master Hyper 212 Evo Gaming Cooling Fan
120GB Corsair Force GT Series SATA-III 6.0 Gb/s SSD – 555MB/s Read & 515MB/s Write
2TB (2TBx1) SATA-III 6.0Gb/s 64MB Cache 7200RPM HDD (Single Drive)
8GB (4GBx2) DDR3/1600MHz Dual Channel Memory (Corsair XMS with Heat Spreader)
[CrossFireX/SLI] ASRock Z77 Extreme6 Intel Z77 Chipset DDR3 ATX Mainboard w/ IRST, Lucid Virtu MVP, XFast Technologies, 7.1 HD Audio,
750 Watts - Corsair CMPSU-750TXV2 80 Plus Power Supply - Quad SLI Ready
NVIDIA GeForce GTX 670 2GB 16X PCIe 3.0 Video Card

 

[Archaic59]

Your system looks very good. The only thing I see you could improve is the graphics. A GTX 970 would bring you up to date and last for several years.