Help with upgrades on my computer

[bloojays23]

I'm deciding whether or not to upgrade any parts on my computer since the holidays are around the corner..I might suggest my relatives to buy these "upgrades" for me. Haha. More like my paycheck is coming in soon.

My rig so far:
CASE ● Rosewill Ranger Mid-Tower ATX/MATX Case
CPU ● AMD Phenom II X4 960T Black Edition Zosma 3.0Ghz
COOLER ● Cooler Master Hyper 212 Plus
MB ● ASUS M5A97 AM3+ AMD 970 SATA 6Gb/s USB 3.0
RAM ● 2 x G.SKILL Ripjaws X Series 8GB 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800)
PSU ● CORSAIR Builder Series CX600 V2 600W
GPU ● SAPPHIRE Radeon HD 6770 1GB GDDR5
OD ● ASUS DRW-24B1ST/BLK/B/AS Black SATA 24X DVD Burner
HDD ● WD Black 1.5 TB 7200 RPM 64 MB

I think I should upgrade my GPU as it seems to be the bottleneck in my computer. BF3 runs low-medium to ensure high fps and SC2 sometimes drops to 1 fps on massive battles (Desert Strike).

Nothing is overclocked as I'm too chicken to do it 😀 and I'm currently running my CPU on 4 cores, instead of 6 cores as I don't see the point right now if I'm only gaming.

Any suggestions,thoughts,advice,tips or recommendations would be awesome.

 

[Deemo13]

I would go with the GPU first.