Gaming PC Build

Hey guys,

Need some help to make sure everything is compatible (I'm fairly sure everything is) and to see if anyone has any recommendations to make over any items on my list or if I've been careless and I'm missing anything crucial. I keep thinking I've forgotton something very important :S I've bolded comments regarding anything I'm not too sure about.

Case - Fractal Define R3 (USB 3.0 version)
http://www.ebuyer.com/236437-fractal-design-define-r3-b...
I'm also grabbing three extra fans for it. How useful are extra case fans?
http://www.ebuyer.com/151390-xilence-black-120mm-case-f...

Motherboard - MSI Z77A - G43 Socket 1155 ATX Motherboard
http://www.ebuyer.com/345353-msi-z77a-g43-z77-socket-11...
Is this a good motherboard?

CPU - Intel i5 3450
http://www.ebuyer.com/349022-intel-core-i5-3450-3-1ghz-...
I'm not sure about the CPU. Is it really worth me getting a 3570K and get a good air cooler for overclocking? I'm expecting games to be GPU limited instead of CPU limited. And I'll probably upgrade before I get any major CPU bottlenecks

GPU - Sapphire Radeon HD 7850 (it's a non reference cooler but at stock clocks). I'm planning on overclocking this.
http://www.ebuyer.com/349747-sapphire-hd-7850-2gb-dvi-h...

PSU - Coolermaster Silent Pro (modular) 600W
http://www.ebuyer.com/160256-coolermaster-600w-silent-p...
I know Coolermaster don't do stellar PSUs but this seemed to have good reviews and was well priced compared to Corsair. Any suggestions to get something different?

Boot Drive - Corsair Force 3 SSD 120GB
http://www.ebuyer.com/268693-corsair-120gb-force-3-ssd-...

Storage Drive - Seagate Barracuda 2TB
http://www.ebuyer.com/319641-barracuda-2tb-sata-3-5in-7...

Memory - 8GB 1600MHz Crucial Ballistix Sport
http://www.ebuyer.com/342352-crucial-8gb-2x4gb-ddr3-160...

Is it worth paying £5 more to get the Corsair low profile vengeance instead?

Optical Drive - Samsung 12x Blu-Ray Drive. SH-B123L
http://www.ebuyer.com/240172-samsung-sh-b123l-sata-blu-...

Operating Software - Retail Windows 7 Home Premium
http://www.ebuyer.com/168373-microsoft-windows-7-home-p...

Monitor - LG IPS Monitor. 23" 1920x1080
http://www.ebuyer.com/284103-lg-ips235v-ips-lcd-led-23-...

I'm also buying a mini USB wireless adapter and an external memory card reader.

I need some suggestions regarding a decent wireless mouse and a keyboard. I'm eyeing the Logitech G700 and Microsoft Sidewinder X4. Any suggestions?

I appreciate any feedback   My maximum budget is £1350 but ideally I'd like it to be less. I'm currently on £1126 including delivery and a few other small peripherals and I still need to pick out extra peripherals such as mouse, keyboard, webcam etc.