This looks ike your best bet to me...
Antec NSK4400 Mini Tower Case - 380W SmartPower PSU
(£46.99) £39.99
Arctic Cooling Freezer 7 Pro CPU Cooler (Socket 775)
(£17.61) £14.99
Asus GeForce 8600 GTS 256MB GDDR3 HDTV/Dual DVI (PCI-Express) - Retail
(£140.99) £119.99
Gigabyte GA_P35C_DS3R (Socket 775) PCI-Express DDR2 & DDR3 Motherboard
(£96.34) £81.99
Samsung SH-S182D 18x18 DVD±RW ReWriter (Black) - OEM
(£15.26) £12.99
Western Digital Caviar Special Edition 160GB 1600AAJS SATA-II 8MB Cache - OEM
(£35.24) £29.99
Intel Core 2 Duo E2160 "LGA775 Conroe" 1.80GHz (800FSB) - Retail
(£63.44) £53.99
Crucial Ballistix 2GB (2x1GB) DDR2 PC2-5300C3 667MHz Dual Channel Kit (BL2KIT12864AA663)
(£70.49) £59.99
Sub Total : £413.92
Shipping : £10.95
VAT : £74.35
Total : £499.22
This way you'll get a decent Case, along with a 380W PSU which is plenty. A very good CPU cooler to allow you to overclock the CPU further. An 8600GTS, will run current games well and is DX10 of course. Motherboard is based on the new P35 chipset, and so will be compatible with the upcoming Penryn CPU's. DVD and HDD are fairly standard. CPU is an entry level C2D, performs well and is highly overclockable. Again, RAM is decent and highly overclockable as well.
Good luck mate.
