ok back..
ok thats £520 basicly.
i would however recomend spending a little more on ram and getting a 4gb kit from ocz eather the 5400 or the 6400 kits from ocz obviously the 6400 would be better but the c2d will probably do ok with the 5400. i would still recomend the 4gb kits even if you are not using a 64bit opperating system as two ram slots is your max so think about futur upgrades... its also insanely cheep.
i would recomend against an 8800gt btw they are a little too hot i wouldnt be happy about putting one in a shuttle especially a single slot, the 3850s are nice and cool now your price range did limit your shassy to a single slot type. but i did choose the best looking.. and more expensive model you can trim some £££ off if you wanted another case type.
Hope thats of some help
Shuttle XPC SG33G5B Aluminium Barebones System - Intel Core 2 Duo (LGA775)
http://www.overclockers.co.uk/showproduct.php?prodid=FS-082-SH&groupid=43&catid=110&subcat=
£229.11 inc VAT
HIS ATI Radeon HD 3850 Pro 256MB GDDR3 TV-Out/Dual DVI/HDMI (PCI-Express) - Retail
http://www.overclockers.co.uk/showproduct.php?prodid=GX-085-HT&groupid=701&catid=56&subcat=416
£117.49 inc VAT
OCZ 2GB (2 x 1GB) PC2-6400C4 Dual Channel Platinum Revision 2 XTC Series DDR2 (OCZ2P800R22GK)
http://www.overclockers.co.uk/showproduct.php?prodid=MY-072-OC&groupid=701&catid=8&subcat=813
£36.41 inc VAT
Hitachi Deskstar T7K500 250GB SATA-II 8MB Cache - OEM (0A33423)
http://www.overclockers.co.uk/showproduct.php?prodid=HD-023-HI&groupid=701&catid=14&subcat=768
£41.11 inc VAT
Intel Core 2 Duo E4500 "LGA775 Allendale" 2.20GHz (800FSB) - Retail
http://www.overclockers.co.uk/showproduct.php?prodid=CP-159-IN&groupid=701&catid=6&subcat=793
£76.36 inc VAT
Samsung SH-S203NBEBN 20x20 DVD±RW Dual Layer Serial ATA Lightscribe ReWriter (Black) - OEM
http://www.overclockers.co.uk/showproduct.php?prodid=CD-092-SA&groupid=701&catid=10&subcat=951
£18.79 inc VAT
here you go ill make a few more comments when i come back from my break
yeah the shuttle psu is a kickass little psu. very strong rails low wattage. different system of getting the power, same effect.
you can basicly add about 100w on its power raiting due to its very high quality.
i think i would go for that same cpu myself too..