What should I upgrade next

Hello all! Last year I built my first Comp. and over the last year I have upgraded a few items and now I would like some opinions on what I should do next. This has become some kind of addiction. I know my secondary HD is slow but it basically holds music and pics nothing that requires a faster or better one at the time at least not til larger SSD's become more affordable.




TOWER - Rosewill CHALLENGER Black Gaming ATX Mid Tower
CPU - Intel I5 2500k (Sandy Bridge)
MOBO - MSI P67A-643 B3
POWER SUPPLY - Rosewill 80plus Green Series (630 Watts)
RAM - G Skill Ripjaws X DDR3 1600 2x4GB
GPU - MSI 7950 Twin Frozr 3GDS
SSD - OCZ Vertex 4 128 GB
Secondary Drive - Seagate Barracuda 7200 500GB
Mouse - R.A.T. 5
Keyboard - Logitech G15 Gaming Keyboard
Monior - Dell SR2320L

Im thinking about getting a 120Hz Monitor either the Samsung 700 SERIES S23A700D or
BenQ XL2420T. I have heard that the Samsung comes down in price every so often making it a nice deal but if Im paying the same price im going with the BenQ. Any thoughts about upgrades?