£1000 New Build (my first build)

Hello,

I’d very much appreciate people’s inputs/advise/recommendations. This will be my first build complete from scratch, I’ve only ever upgraded bits and pieces before. I haven’t even done much of that in the past couple of years, so I’ve been having to do a lot of reading online. I think I’m getting there, but wanted some advise, and to make sure it all looks good (just in case I’ve overlooked something).

It’s a complete new build – the only things I already have are my keyboard and my speakers.

Approximate Purchase Date: This coming week

Budget Range: £1000-£1,100

System Usage from Most to Least Important: Gaming, surfing the internet, watching movies

Are you buying a monitor: Yes

Do you need to buy OS: Yes

Preferred Website(s) for Parts: any UK ones

Location: London, UK

Overclocking: Yes

SLI or Crossfire: No

Your Monitor Resolution: Aiming at 1920x1080 or 1920x1200

Additional Comments: I would like a quiet PC. In terms of games, at the moment I'm thinking Diablo 3 and Skyrim

Why Are You Upgrading: Currently PC is over 5 years old, and tends to restart randomly

PCPartPicker Build: http://pcpartpicker.com/uk/p/cFrk

CPU, Intel Core i5-3570K
CPU Cooler, Cooler Master Hyper 212 EVO

Motherboard, Gigabyte GA-Z77-D3H (ATX)

Video Card, AMD Radeon HD7850
This is pushing my budget a bit, but seems to be worth it from what I’ve read online. Not sure which exact one to go for though, any suggestions (is any known to be any quieter?)

Memory, Corsair Vengence or G.Skill Ripjaws, 2x4GB
From what i’ve read online 8GB of RAM should be plenty, and these two brands seem to be fairly well recommended. Will I need ‘low profile’ RAM (considering CPU cooler) or should I be okay with the normal stuff?

Storage
1) Samsung 830 Series 128GB 2.5” SDD
2)Western Digital Caviar Blue 1TB 3.5” HDD

Optical Drive, Sony AD-7261S-0B DVD/CD Writer
From what I read online, any drive seems to be as good as any other really?

Case, Fractal Design Define R3 ATX Mid-Tower

Power supply, Corsair 650W ATX12V / EPS12V? Help?
This is where I really need advice – 500/600/650W? Corsair is the only name I really know. How much should I be looking to spend on a PSU? Can I go cheaper than this one (which is about £80)? Is there any low-noise ones I should be considering?

OS, Windows 7 Home Premium (64-bit)

Monitor, Dell UltraSharp U2312HM 23"
There doesn’t seem to be as much out there in terms of reviews for monitors (compared to say, video cards or motherboards), but this one seems to be decent?

Mouse, ?
I haven't had time to read much about mice, can anyone recommend some ideas here? I'm thinking £20/£30


Thanks in advance