Right had a look for you and this is what I would build with your budget:
http://pcpartpicker.com/uk/p/dKNnPlus this PSU which it didn't have for some reason:
http://www.scan.co.uk/products/750w-ocz-ocz750fty-uk-fatal1ty-series-85-eff-80plus-135mm-fan-psuCPU: Intel Core i7-3770K 3.5GHz Quad-Core Processor
CPU Cooler: Noctua NH-D14 65.0 CFM CPU Cooler
Motherboard: MSI Z77A-GD55 ATX LGA1155 Motherboard
Memory: Corsair Vengeance 16GB LP (4 x 4GB) DDR3-1600 Memory
Storage: Corsair Force Series GT 90GB 2.5" Solid State Disk
Storage: Seagate Barracuda 2TB 3.5" 7200RPM Internal Hard Drive
Video Card: MSI GeForce GTX 670 2GB Video Card
Case: Cooler Master HAF X ATX Full Tower Case
Optical Drive: HP 1270i DVD/CD Writer
Monitor: Asus VH236H 23.0" Monitor
Operating System: Microsoft Windows 7 Home Premium SP1 (64-bit)
Keyboard: Logitech K800 Wireless Slim Keyboard
Total: £1150.39
I changed the processor for the reasons I listed above - the 3770k sounds best for you.
Motherboard - I have that exact one and it's rock solid stable (even with a huge OC) and plenty of features, I can't recommend it highly enough.
CPU cooler - Be warned, that thing is HUGEEEEE. I love it though, by far the best cooler out there. Also allows a really nice overclock without raising temperatures much. I know you said you don't know much about overclocking but it's really easy to read up and and slowly ease yourself in to - with a decent cooler on an IB i7 chip you can get 25-35% performance boots by overclocking, so it's definitely worth looking in to (
but as always BE VERY CAREFUL IF YOU DO IT AND START VERY VERY SLOWLY).
16GB memory should be enough even for rendering. Make sure you get the LP (low profile) stuff since it means it won't get in the way of the CPU cooler. I have the vengeance sticks and they're good, stable sticks.
I added a 90GB SSD purely as a boot drive. Honestly the difference it makes is immense. If you were going to install any programs on the boot drive then maybe you'd want to look in to a bigger one (W7 installation will use about 16GB) but 90GB is probably adequate. Could maybe even get away with 60, that's what I used to run.
The main HDD I upgraded to a 2TB since it's ~£10 more for double the capacity - trust me the day will come when you get over 1TB and you'll be thankful
but if you really think you'll use less then go for a 1TB/1.5TB drive. All your programs would be stored on there, with Windows and anything you want booting quickly (e.g. I have Photoshop and Vegas Pro) on the SSD.
The graphics card is probably one of the best out there right now. It's pricey, but it's damn good. It's an underclocked GTX680 (so it's basically the same card, they just scale the speed back a bit and lower the price) and can easily outperform it. The only reason I added the pre-overclocked version was because for some reason it's £15 cheaper on Scan. If you see a non overclocked one cheaper elsewhere go for that. Ideally look for EVGA or MSI cards, they're usually the best. EVGA have some excellent returns policies and customer service.
Case: Very good case for airflow, although with the size of the gfx card and cpu cooler you have to remove the side cooling duct (just gets in the way anyway in my opinion). It's a big case though. Really big. Check the measurements if you decided to go for it and make sure it'll fit where you want it.
Optical drive: I just put one in since I don't really see a need for 2 but if you think you'll use it regularly enough then add another one. It's only £13.
Monitor: I don't really know about this monitor but it's the one you added so I left it in. If you wanted to spend more to make sure you got "the best" so to speak then look at an IPS panel monitor. They're usually £200+ though for a 23 inch.
I left the OS and keyboard the same too.
Comes in at ~£1150 for everything. Obviously it is best to use as few suppliers as possible to reduce hassle with returns etc and also shipping costs. I recommend looking at Scan (
http://www.scan.co.uk) as they're usually amongst the best priced. They also have a great "Daily Deals" section, well worth a look! Check it on the day you decide to buy and whatever it is you buy, they might well have an offer on it. Sometimes it's only £2-3 and sometimes it's ~£20, every little helps! Obviously look on other websites too for costs there, that price is just a rough guide but those are the parts I'd pick and it should cost around that.
Oh and it runs WoW on ultra at all times on dual screen with ease - I do it and have a very similar rig
EDIT: Forgot to add PSU price in, so ~£1225 for it all.