Core i5 2500k or i7 3770k?

Only using this pc for gaming.. thinking of going with the i5 2500k do to how cost effective it is, but anyone feel a need to move forward to a newer chip such as the i7 3770k or i5 3570k, is it simply overkill?.. input welcome. Also with either overclocked to around 4.6-4.8 is the Noctua nh d-14 enough cooling wise?

Any input welcome.

Specs so far:
Chassis Model: Special Deal Hot Seller - Cooler Master Storm Trooper
Exterior Finish: - Standard Factory Finish
Trim Accents: - Standard Factory Finish
Processor: Intel Core i5 2500K 3.30GHz (Unlocked CPU for Extreme Overclocking) (Quad Core)
Motherboard: ASUS SABERTOOTH Z77 (Intel Z77 Chipset) (Features Thermal Armor and Thermal Radar)
System Memory: 16GB DDR3 1600MHz Digital Storm Certified Performance Series (Highly Recommended) (Hand Tested)
Power Supply: 800W Corsair GS (Dual SLI Compatible)
Expansion Bay: - No Thanks
Hard Drive Set 1: Operating System: 1x (120GB Solid State (By: Corsair) (Model: Force GT Series CSSD-F120GBGT-BK) (SATA 6Gbps)
Set 1 Raid Options: - No Thanks
Hard Drive Set 2: Multimedia\Data: 1x (1TB Western Digital Caviar (7200 RPM) (Model: Black Edition)
Hard Drive Set 3: Backup\Misc.: - No Thanks
Optical Drive 1: DVD-R/RW/CD-R/RW (DVD Writer 24x / CD-Writer 48x)
Optical Drive 2: - No Thanks
Internet Access: High Speed Network Port (Supports High-Speed Cable / DSL / Network Connections)
Video Card: 2x SLI Dual (NVIDIA GeForce GTX 670 2GB (PhysX) (FTW Overclocked EVGA 02G-P4-2678-BR)
Add-on Card: - No Thanks
Sound Card: Integrated Motherboard Audio
Extreme Cooling: AIR: Stage 2: Noctua NH-D14 SE2011 Extreme Performance <b></b>
H20 Tube Color:- Not Applicable, I do not have a FrostChill or Sub-Zero LCS Cooling System Selected
Chassis Airflow: Upgrade Chassis With LED Performance Fans (Red) (Up to 6 Fans)
Internal Lighting: Internal Chassis Lighting System (Red)
Enhancements: - No Thanks
Chassis Mods: - No Thanks
Noise Reduction: - No Thanks
LaserMark: - No Thanks
Boost Processor: Stage 2: Overclock CPU 4.5GHz to 4.8GHz (Requires Pro/Deluxe/Sabertooth Motherboard)
Boost Video Card: - No Thanks, Please do not overclock my video card(s)
Boost Memory: - No Thanks, Please do not overclock my memory <b></b>
Boost OS: - No Thanks, Please do not tweak the services on the operating system
Windows OS: Microsoft Windows 7 Home Premium (64-Bit Edition)
Recovery Tools: Windows Recovery Toolkit (Bundled with Windows 7 CD)

Edited by Nemicyst - 09 Jul 2012 at 5:19pm

Yes alex is correct but you should go with ivy bridge over sandybridge so choose the 3570k,

Noctua d14 is the best.  No problem there.