To be honest I put in the Xclio case because I was doing the spec to a cost, but if your not purchasing the monitor and other peripherals then there is scope to improve certain aspects, case included within the budget that you gave. With this in mind here is a revised spec with RAM with tighter timings and a new case:
All parts from Scan.co.uk unless stated
Intel Core 2 Duo E6600 S775, 2.40Ghz, 1066Mhz FSB, Conroe Core, 4M Cache Retail £252.57
Zalman CNPS9500-AT Intel LGA775 Aero Flower Cooler £30.42
Gigabyte GA 965P-DS3, Intel P965, S775, PCI-E (x16), DDR2 533/667/800, SATA II, ATX £98.34
2Gb (2X1Gb) Corsair TwinX XMS2, DDR2 PC6400 (800), 240 Pin, Non-ECC Unbuffered, CAS 4-4-4-12, EPP £194.63
1Gb XFX 7950GX2 OEM, PCI-E (x16), 1200 MHz GPU 500 MHz, 48 Pipes, S-Video/TV Out 2 x Dual Link DVI-I £292.58
2 X 250 Gb Samsung Spinpoint P SP2504C, SATA300, 7200 rpm, 8MB Cache, 9.0 ms, NCQ (2X £49.69) = £99.38
Pioneer DVR-111 Black 16x16 x5 RAM DVD±RW Dual Layer DVD Writer (Reduced Length) OEM £25.06
Antec P180 EU PC Case Performance One Series £87.26 (
www.dabs.com)
580W HiperPower HPU-4M580 Black SLi Ready Modular 20 + 24Pins P8 Ready ATX2.2/BTX £52.82
Total: £1133.06