It depends if the CPU is OEM or retail. Retail provides fan and any necessary extras, OEM doesn't.
Here is a quick pricing I've thrown together, I've put the components you've listed in including the SG01, though personally I prefer the lian li V351 which would do you the job as well. I haven't listed any 3rd party CPU cooler as its up to you if you want it or not. Also, if you are planning on overclocking and making your computer as fast a possible, maybe get a smaller HDD with single platter for OS and larger for data? (just an idea for you)
Also unless you are particular about your sound, the onboard sound provided by the Mobo should be adequite
Intel Core i7 920 D0 Stepping (SLBEJ) 2.66Ghz (Nehalem) (Socket LGA1366) - Retail £201.99
(£175.64)
MSI X58M Intel X58 (Socket 1366) PCI-Express mATX DDR3 Motherboard £129.98
(£113.03)
Silverstone Sugo SG01B-F Evolution Aluminium Micro-ATX Case - Black (No PSU) £89.99
(£78.25)
Patriot Viper 6GB (3x2GB) DDR3 PC3-12800 (1600MHz) Low Latency Tri-Channel (PVT36G1600LLK) + 3D Mark Vantage Benchmarking Software £87.99
(£76.51)
OCZ ModXStream 780W SLI Ready Modular Power Supply £59.98
(£52.16)
Seagate Barracuda 7200.12 500GB SATA-II 16MB Cache - OEM (ST3500418AS) £39.99
(£34.77)
Sub Total : £530.36
Shipping cost assumes delivery to UK Mainland with:
DPD Next Day Parcel
(This can be changed during checkout) Shipping : £11.25
VAT is being charged at 15% VAT : £81.24
Total : £622.85
Also, just throwing it out there. I know the 8800GTX will run most things, but if you are planning on upgrading it.
Something like this would be good. It is smaller, should run cooler, don't know about noise, and use less power than the 8800GTX on stock. If not maybe try pick up a HR-03+ for the GTX... I've got one... which keeps it nice and cool and blooming quiet.
O I just thought, if you are interested in using an AM3 chip instead, you can get a system for much cheaper.
AMD Phenom II X4 Quad Core 955 Black Edition 3.2GHz (Socket AM3) - Retail £145.98
(£126.94)
Asus M4A785TD-M Evo AMD 785G (Socket AM3) PCI-Express DDR3 Motherboard £77.99
(£67.82)
OCZ Platinum AMD Edition 4GB (2x2GB) DDR3 PC3-12800C7 1600MHz Dual Channel (OCZ3P1600LVAM4GK) £60.00
(£52.17)
With the Case, PSU and hard drive you selected added to the price, inc tax and del. I get £486.86
Good luck, less us know what you do.