Hey there. I'm a new member so TechSpot won't let me send PM's yet, so I'll reply here.
Let me start off by saying this: your current configuration resulting from this thread is probably a very good start. I think it's more than adequate. I would say that the advice given in this forum has been pretty spot-on. I think in your budget, the system you have picked out will be close to maximizing bang for buck.
I think if you throw in a 15-22" monitor with this system for £70-112, you'd be golden. I have used Acer's cheap monitors for years and for basic use and even gaming, they're great. They may not have the best color accuracy and consistency, but for the price you can't complain.
I used one of the original Intel Quad Cores up until a few months ago when I got the chance to upgrade (for fun, not out of necessity). I'm a enthusiast photographer and videographer, and had done a considerable amount of video editing and rendering on that system, and the i5 750 is going to be more powerful than that. I think your current selection would be awesome.
Having said all that, if you want to trim off a little money and there, see the points that follow:
The motherboard you have chosen may be slight overkill, but is probably relatively future-proof since it includes the USB 3.0 ports. I'm a tech enthusiast (who spends far more than I should to satisfy my gadget envy) and I don't even have USB 3.0. For the i5, there are several boards that could shave off around $30 (~£20). I would suggest looking at the Intel BOXDH55HC, for ~£20 less than your current selection. Trimming off some of the features (like more than one PCI Express 2.0 x16 port or less max RAM support (16GB vs 32GB, which the average user will never get close to) can save you a few bucks here and there. This Intel motherboard has onboard graphics (which you won't want/need since you'll have a graphics card) so there may been even slightly cheaper options. I'll send you anything I run across.
The graphics card (ATI 5770) is on par with what I've been gaming with up until recently as well, so it should handle casual gaming very well, and is probably one of the best choices in that price range. That being said, you might be able to find some cards that are slightly cheaper, but not without sacrificing quite a bit of performance. I suppose a close to same performance would be an Nvidia GTS 250 which would cut another ~£20-30 off your price tag. I'd probably stick with this choice, but if you can get an XFX branded 5770 for a similar price, they have a double lifetime warranty. EVGA is my other favorite brand for GPUs.
There may be slightly cheaper options for RAM, such as OCZ's Gold RAM (or any OCZ RAM is typically good), which I use and it runs great. It was the cheapest option a few months ago when I built this machine.
As for the discussion regarding SSD's for your budget, I think CPU/GPU take priority over the SSD, and since getting a monitor in is going to be tight anyways, I think a 500GB - 1TB HDD would be just fine. Even smaller, but 500GB and 1TB are the sweet spot for the lowest cost/GB. Just my .02 USD.
Another thing that you (may) have overlooked is an optical drive. Perhaps you have an old one, or don't need one, but you probably want a DVD+/-RW for video editing. They're cheap, around $25 or £17, so nothing too incredibly expensive. Also, ensure you get a SATA drive and not a PATA drive. Easy mistake to make.
You may also need a Windows license, which aren't necessarily cheap. I'm not sure what your operating system of choice is, but that is something to consider in the pricing.
I did take a quick look at various brand names, and they unfortunately offer a lot less customization for your location, so I would say building your own is still the best option price-wise to maximize performance.
I know this message was kind of all over the place but I think most of the info is pertinent, and hopefully it helps and doesn't simply muddy the waters. If you have anymore questions, please feel free to ask. I'm more than happy to help. Please do let me know what you end up ordering when you decide as well, and hit me up with any questions you have regarding the construction and installation of everything.
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