BUDGET RANGE: £850 max before shiping cost (Aprox $1280 US)
SYSTEM USAGE FROM MOST TO LEAST IMPORTANT:Gamining, Internet, Website managment (I manage a fewsites for friends and a club or two i am a member off)
PARTS NOT REQUIRED: keyboard, mouse, monitor, speakers, OS, surrond sound speakers
PREFERRED WEBSITE(S) FOR PARTS: Aria / Scan althought open to suggestions
COUNTRY OF ORIGIN: I'm in the UK but happy about buying from overseas
PARTS PREFERENCES: by brand or type : Full tower case (Prefer an ATX board) - large cases prefered but not nessercary! and Intell quad core CPU (a must)
OVERCLOCKING: No - I don't know how but if someone could provide a link to overclocking 1-0-1 that would be much appreciated ( I reconise th eoclling in the below spec would not be adequate for this)
Maybe SLI OR CROSSFIRE: Yes - either way is fine but is not an actual a requirment!
MONITOR RESOLUTION:N/A i tend to run stuff in 1280 x1024, i know its a crappy small res but it is what i use!
ADDITIONAL COMMENTS: Any hint / tips / advice on what to look for in genrall would be wonderful, i would say i am a very confident computer user and i would in IT tech support but have never built a system.
Also any GFX will have to be able to support 2 monitors, one of which is a "hi-def" monitor, ( i have a 14" display and a 32" hi-def display (actully a TV but i use it on my PC - it works suprisingly well), i know they could not be more diffrent but it works for me)
The power supply you linked is not from a company that I know produces good PSUs, for that price I'm sure you can get much better power supplies, and it's overkill for your build. So I'd suggest changing to this: Antec Earthwatts 650 £64 As it has enough power to crossfire quite a few cards, including the two 9800GTs you were thinking about, which I think is a bad idea, as you can buy single cards that will offer better performance and give you an upgrade path.
Those two changes have saved about £45. Which is enough to afford a 5830, which isn't the best choice as it is more power hungry than it's much more powerful brother, the 5850. Also a long one will not fit in your case. This one (XFX 5830 £213) would fit, but I think it is slightly out of your budget. Anyway you should see if you can get a good single card along with a power supply that can power two of them. Ideally if you could find £50 from somewhere (possibly from within this build) you could get a 5850 which would be very nice for a gaming rig.
Alternatively you could get a 5770 (or GTX 260), add another one later. And use the £45+/- to make the foundation of this build more solid. Asus P7P55D-E PRO £163 This board doesn't have a foxconn socket (the board you have at the moment does, and people have had problems overclocking on Lynnfield boards with foxconn sockets, it doesn't really matter if you don't overclock tho), it also has SATA 6Gbps, USB3 and has two good PCI-E slots. I would also go for some faster RAM and then see if you can get a much better power supply.
I know what I said up there is a jumble. I think if you get a 5770, then you can make a lot of good changes that makes the base (motherboard, RAM, PSU etc) much better, so that possibly later you can add another 5770 or replace it with a better card.
During the whole time I've been writing this response I've been thinking to myself that you were not getting too much for your £850, so I checked some of my old posts and came up with this:
You have the CPU you want, a good microATX board, with two good PCI-E slots for crossfire. Much faster RAM. A much better single video card, that the PSU is capable of crossfiring. A Blu-ray drive that you seem to want. The much faster and cheaper Samsung F3, and a good case, probably the best for under £50.