Looking for minor upgrade opinions on my rig

[Moridous]

motherboard
ASUS Crosshair IV Formula AM3 AMD 890FX SATA 6Gb/s USB 3.0 ATX AMD Motherboard

processor
AMD Phenom II X4 960T Zosma 3.0GHz Socket AM3 95W Quad-Core Desktop Processor HD96ZTWFGRBOX

ram
currently 8 gigs, soon to be 16

video card
ASUS ENGTX550 TI DC/DI/1GD5 GeForce GTX 550 Ti (Fermi) 1GB 192-bit GDDR5 PCI Express 2.0 x16 HDCP Ready SLI Support Video Card

power supply
Apevia ATX-WA750W Warlock 750-Watt ATX Power Supply - SLI and Crossfire Ready, 135mm Fan, Clear Sides

cant think of anything i've missed that might be important, i'd prefer not to mess with my hard drive if at all possible.

my processor usually runs ~3.5 instead of 3.0

my initial thought to upgrade would be the video card, but as stated i am open to opinions as well as suggestions

 

[Snipeye]

GPU or HDD to SSD would be the two parts I look at upgrading. The mobo, CPU, and PSU looks good to me (I've actually used Apevia PSU's before; had one for over 3 years without fail. I use it now as my test PSU now for troubleshooting)

 

[Puke-N-Snot]

Why not take your existing GPU & make it SLI, I see the ASUS ENGTX550 Ti/DI/1GD5 GeForce GTX 550 Ti (Fermi) on newegg for $129 with a $20 rebate.
http://www.newegg.com/Product/Product.aspx?Item=N82E16814121630&nm_mc=KNC-GoogleAdwords&cm_mmc=KNC-GoogleAdwords-_-pla-_-Desktop+Graphics+Cards-_-N82E16814121630&gclid=COKEvpymgbUCFehDMgodsUgAEw

Also would agree with Snipeye & suggest looking into a SSD if your not already using one