Might I suggest that sometimes full disclosure is not always necessary.

This should do all you require easily, I don't know too much about the speakers but they have a decent specification from what I can tell.
Intel Core 2 Quad Pro Q6600 "Energy Efficient SLACR 95W Edition" 2.40GHz (1066FSB) - Retail £142.99
(£168.01) £142.99
(£168.01)
OcUK GeForce 8800 GTX 768MB GDDR3 HDTV/Dual DVI (PCI-Express) - OEM £199.99
(£234.99) £199.99
(£234.99)
Abit IP35 (Socket 775) PCI-Express DDR2 Motherboard £72.99
(£85.76) £72.99
(£85.76)
Dell Ultrasharp 2407WFP-HC 24" Widescreen LCD Monitor - Midnight Grey £359.99
(£422.99) £359.99
(£422.99)
OCZ 4GB (2x2GB) PC2-6400C4 800MHz Reaper HPC Enhanced Bandwidth Edition Dual Channel DDR2 (OCZ2RPR800C44GK) £64.99
(£76.36) £64.99
(£76.36)
Antec P182 Super Midi Tower Case - No PSU (Gun Metal Black) £74.99
(£88.11) £74.99
(£88.11)
Corsair HX 620W ATX2.2 Modular SLI Compliant PSU (CMPSU-620HXUK) £74.99
(£88.11) £74.99
(£88.11)
Creative Sound Blaster X-Fi Xtreme Gamer 7.1 Sound Card - Retail £51.99
(£61.09) £51.99
(£61.09)
Pioneer DVR-212DBK 18x DVD±RW SATA Dual Layer ReWriter (Black) - OEM £17.99
(£21.14) £17.99
(£21.14)
Western Digital Caviar SE16 500GB SATA-II 16MB Cache - OEM (WD5000AAKS) £55.99
(£65.79) £111.98
(£131.58)
Logitech G15 Rev.2 Gaming-Grade Illuminated Keyboard - Retail £47.99
(£56.39) £47.99
(£56.39)
Logitech MX518 Gaming-Grade Optical Mouse - Retail £28.99
(£34.06) £28.99
(£34.06)
Creative GigaWorks G500 THX Certified 5.1 Speakers £129.99
(£152.74) £129.99
(£152.74)
Microsoft Windows Vista Home Premium 64-Bit Edition DVD - OEM - 1Pk (66I-00788) £59.99
(£70.49) £59.99
(£70.49)
Tuniq Tower 120 CPU Cooler (Socket 478/754/939/940/AM2/LGA775) £27.99
(£32.89) £27.99
(£32.89)
Sub Total : £1,467.84
Shipping cost assumes delivery to UK Mainland with:
City Link Parcel Next Day (Delivered Mon-Fri)
(This can be changed during checkout) Shipping : £34.58
VAT is being charged at 17.5% VAT : £262.92
Total : £1,765.35