APPROXIMATE PURCHASE DATE: As soon as possible (within 1 month). BUDGET RANGE: £400-700 UK Pounds. SYSTEM USAGE FROM MOST TO LEAST IMPORTANT: Gaming (such as FS9/X, RCT3) and screen recording; video editing and rendering using Adobe After Effects, Adobe Flash, Sony Vegas; image editing in Photoshop CS4; watching HD videos; office documents and surfing the web. PARTS NOT REQUIRED: Keyboard, Mouse, Speakers, Monitor. PREFERRED WEBSITE(S) FOR PARTS:http://www.misco.co.uk/ OR any other large online retailer in the UK (basically, not Newegg.com). COUNTRY OF ORIGIN: United Kingdom. PARTS PREFERENCES: Intel CPU, 4GB RAM at least, and 1GB dedicated Nvidia graphics (I've been advised to go for Nvidia; feel free to suggest another). OVERCLOCKING: Maybe. MONITOR RESOLUTION (on 24in monitor): 1280x1024. A graphics chip that can handle more is a plus. ADDITIONAL COMMENTS: Quiet fans on case, but good enough cooling for hard tasks.
The GPU is way overkill for your current resolution. If you're planning to step up to a 1920x1080 monitor, it will be awesome for that resolution. If you don't drop it down to the HD 5850 and pick up a new monitor.
AMD builds are a lot cheaper and give about the same gaming performance as Intel builds. AMD is the best currently for price to performance, while Intel is the best at the high end performance
I've already priced it out on Newegg. I need you to look up the prices wherever you want to buy and let me know if it's too expensive or if I have some more cash to play with.
You can't actually buy it from Newegg, as they only ship in the US. They're the top retailer over here, and the best for researching parts.
EDIT: Yes, the PSU will only draw the amount of watts it actually needs to run the computer. For example, if the current load needs 400W, the PSU will draw 500W from the wall, pass on 400W to the other components, and lose 100W to heat (80% efficiency).
1. Paying 4 pounds less but 1600/CL9 instead of CL7
2. Not too sure about that case
3. Personal preference: USB wifi adaper - ease of installation/transfer
The case I thought would be easier to manage having a fan already installed in the front - I couldn't find any other cheap-range cases that had space for a fan in the front. What exactly is it about the case that you would improve? But very good point about the WiFi. I'll might get a USB adaptor instead...