Welcome to the forums. Maybe go for something like this. You have good solid components with decent overclocking potential. I don't know much about the monitor though, I just picked one in budget with decent specifications so have a look in the Monitors sub-forum to see if it is any good.
Intel Core 2 DUO E6600 "LGA775 Conroe" 2.40GHz (1066FSB) - Retail £173.99
(£204.44) £173.99
(£204.44)
Gainward BLISS GeForce 8800 GTS 640MB GDDR3 HDTV/Dual DVI (PCI-Express) - Retail £214.99
(£252.61) £214.99
(£252.61)
GeIL 2GB (2x1GB) PC6400C4 800MHz Ultra Low Latency DDR2 Dual Channel Kit (GX22GB6400UDC) £114.99
(£135.11) £114.99
(£135.11)
Lian-Li PC-7 PLUS Aluminium Midi-Tower Case - Black £49.99
(£58.74) £49.99
(£58.74)
Asus P5N-E SLi nForce 650 (Socket 775) PCI-Express DDR2 Motherboard £69.99
(£82.24) £69.99
(£82.24)
Seagate Barracuda 7200.10 320GB ST3320620AS SATA-II 16MB Cache - OEM £56.99
(£66.96) £56.99
(£66.96)
NEC AD7170S Serial ATA 18x18 DVD±RW Dual Layer ReWriter (Black) - OEM £18.99
(£22.31) £18.99
(£22.31)
Corsair HX 520W ATX2.2 Modular SLI Compliant PSU (CMPSU-520HXUK) £59.99
(£70.49) £59.99
(£70.49)
Tuniq Tower 120 CPU Cooler £24.99
(£29.36) £24.99
(£29.36)
BenQ FP202W 20" Widescreen LCD Monitor - Black £219.99
(£258.49) £219.99
(£258.49)
Sub Total : £1,004.90
Shipping cost assumes delivery to UK Mainland with:
City Link Parcel Next Day (Delivered Mon-Fri)
(This can be changed during checkout) Shipping : £14.95
Vat : £178.47
Total : £1,198.32