Needs Advice On Upgrading

Approximate Purchase Date: Christmas.

Budget Range: Not really sure yet.


System Usage: Gaming mostly, some movies/youtube.


Parts Not Required: keyboard, mouse, monitor, speakers, OS


Preferred Website(s) for Parts: newegg.com, ncix.com (i can actually pick these up in store rather than order online)


Country of Origin: Canada


Overclocking: Maybe


SLI or Crossfire: No


Monitor Resolution: 1440x900


Additional Comments:

My current PC:

CPU: Intel Core 2 Duo E6600 2.4GHz
Mobo: ASUS P5Q Pro
Graphics Card: EVGA GeForce 480 GTX
Memory: 2xCORSAIR XMS2 1GB 240-Pin DDR2 SDRAM DDR2 800 (PC2 6400) Desktop Memory Model CM2X1024-6400
PSU: PC Power And Cooling 750W
OS: Windows 7 Home Premium 32-bit
Case: Antec Nine Hundred Black Steel ATX Mid Tower Computer Case

I was thinking about upgrading my CPU/Mobo/RAM to complements my Graphics Card since I'm pretty sure my current build is quite terrible.

Upgrades:

CPU: Intel i5-2500K 3.3ghz Quad Core Unlocked
Mobo: ASRock P67 EXTREME4 GEN3 LGA 1155 Intel P67 SATA 6Gb/s USB 3.0 ATX Intel Motherboard
RAM: Patriot Gamer 2 Series 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model PGD38G1600ELK

I'm open to any suggestions and appreciate the help.