Is there anything worthwhile to upgrade at this point?

System specs;

AMD PhenomII X4 965 Black Edition Quad-Core CPU (3.4Ghz)
Single Hard Drive - 500GB SATA-II 3.0Gb/s 16MB Cache 7200RPM HDD
LG 22X DVD+/-/+/-RW + CD-R/RW Dual Layer Drive
MSI 770-G45 AM3 770 Chipset CrossFireX Support DDR3 Socket AM3 ATX Mainboard w/ 7.1 HD Audio, GbLAN, USB2.0, SATA-II, RAID, 2 Gen2 PCIe, 1 PCIe X1, & 3 PCI
6GB (2GBx3) DDR3/1600MHz Dual Channel Memory Module
Windows 7 Home Premium 64 bit
850 Watts ZX Series Power Supply (Modular)
HIGH DEFINITION ON-BOARD 7.1 AUDIO
Nvidia Geforce GTX 760 2GB DDR5 Video Card [DirectX 11 Support]
DX 11 & DX 9 installed


Thanks in advance tech gurus.

"It is useless for the sheep to pass resolutions in favor of vegetarianism, while the wolf remains of a different opinion."--- William Ralph Inge

"The ORIGINAL Barkhorn"