I think this includes everything that you need here, no clue about the speakers but they are cheap and 5.1.
Gigabyte GA_P35C_DS3R (Socket 775) PCI-Express DDR2 & DDR3 Motherboard £69.99
(£82.24) £69.99
(£82.24)
GeIL 2GB (2x1GB) PC6400C4 800MHz Ultra Low Latency DDR2 Dual Channel Kit (GX22GB6400UDC) £39.99
(£46.99) £39.99
(£46.99)
Corsair HX 520W ATX2.2 Modular SLI Compliant PSU (CMPSU-520HXUK) £57.99
(£68.14) £57.99
(£68.14)
Intel Core 2 Quad Pro Q6600 "Energy Efficient 95W Edition" 2.40GHz (1066FSB) - Retail £153.99
(£180.94) £153.99
(£180.94)
Western Digital Caviar SE16 500GB 5000AAKS SATA-II 16MB Cache - OEM £63.99
(£75.19) £63.99
(£75.19)
Pioneer DVR-212D 18x18 DVD±RW Serial ATA Dual Layer ReWriter - (Black) OEM £17.99
(£21.14) £17.99
(£21.14)
Akasa AK-ZEN-01-BK Zen Black Case - No PSU £26.99
(£31.71) £26.99
(£31.71)
Sapphire ATI Radeon HD 2900 XT SILENT Heatpipe 512MB GDDR3 VIVO TV-Out/Dual DVI (PCI-Express) - Retail £204.99
(£240.86) £204.99
(£240.86)
Creative Inspire T6100 5.1 Speakers - OEM £29.99
(£35.24) £29.99
(£35.24)
Microsoft Black Value Pack 2.0 - OEM (S82-00029) £12.99
(£15.26) £12.99
(£15.26)
Microsoft Windows Vista Home Premium 64-Bit Edition DVD - OEM - 1Pk (66I-00788) £54.99
(£64.61) £54.99
(£64.61)
LG L226WTQ 22" Widescreen LCD Monitor - Black/Silver £169.99
(£199.74) £169.99
(£199.74)
Sub Total : £903.88
Shipping cost assumes delivery to UK Mainland with:
City Link Parcel Next Day (Delivered Mon-Fri)
(This can be changed during checkout) Shipping : £24.95
VAT is being charged at 17.5% VAT : £162.55
Total : £1,091.38