I'm planning on building my first PC at the end of this month and have decided upon most of the components. They are listed below:
CPU Cooler: Corsair H100i
RAM: Corsair 8GB (2x4GB) DDR3 1600MHz Vengeance CL8 (8-9-8-24)
SSD: Samsung 840 Pro 128GB
HDD: Western Digital Caviar Black 1TB 7200 RPM
Case: Corsair Carbide 400R
GPU: Inno3D GTX 670 HerculeZ 3000 Edition 2GB GDDR5
The primary use of this build is for gaming (Skyrim, BF3, Total War, etc). I'll be looking to add another GTX 670 at some point in the future as well as overclocking the processor to 4.50GHz or more as soon as I feel confident enough about what I'm doing.
I was wandering what motherboard would comfortably support overclocking to this level and 2 way SLI for around £100 and what wattage PSU should I look at to support this system?
As far as the cooler, you're really not going to need anything like that.
The Cooler Master Hyper 212 Evo is highly rated by gamers and does the job and the savings from the one you chose would pay for your power supply.
To each his own I guess, but if you look around for OC'ing advice, the ASRock Extreme4 and Extreme6 are crowd faves. I've never seen a Gigabyte mobo recommended for OC'ing. Either PSU will work great, obviously the Corsair is far more robust, as is the price.