Budget Range: around £500 +/- £100 Best 'bang for my buck' rules apply
System Usage from Most to Least Important: 90% gaming / 10% internet
Are you buying a monitor: Not at the moment. I'm using a standard 1080p 24" at the moment but will be looking to upgrade to a nice 1440p 27" within 6 months time.
Parts to Upgrade: CPU and Mobo, possibly new cooler. PSU is a 1Kw Cooler Master Silent Pro so power is not an issue. Cooler is a Thermaltake Frio.
Do you need to buy OS: No
Preferred Website(s) for Parts: Scan or EBuyer are my usual sites
Location: Surrey, UK
Parts Preferences: I don't have a preference of board although onboard wireless is a plus. My main preference is the best (least difficult) CPU to O/C to ~4.5GHz
Overclocking: Yes. I always overclock my systems so this is an important feature and the main reason I'm asking for suggestions.
SLI or Crossfire: Yes. Current system has 2 GTX 570s in SLI so the new system will need to be SLI compliant. Will probably move to a non-SLI setup in the future but for now 2 570s still do the job just fine. Maybe when the 800 series comes along.
Your Monitor Resolution: 1920x1080 (2560x1440 in the near future)
Additional Comments: There's lots of opinions on whether to go Ivy even though 1155 is a dead socket or Haswell although there's been a lot of concern about it's O/C potential.
And Most Importantly, Why Are You Upgrading: I was a Sandy Bridge early adopter with an i7-2600K and Asus P8P67 Pro B1 Rev. board. I took the risk not sending it back during the recall determining by the time I ran into troubles I'd be looking to upgrade anyway. That day is now upon me as I'm having issues with the SATA ports
I know Hyperthreading is all but useless for gaming so the fistfight is really between the 3570k and 4670k and mobo to go with it. Any suggestions with supporting reasons are greatly appreciated!