Hi Forumites,
Sorry for the late response, been busy on client site for few days.
Thanks to all of those that PM'd & emailed me with quotes. In the end I acquired a system from Game Boyz and am totally happy with installation & after sales service. System they offered as per invoice:
ATX CHASSIS - AZTEC
GIGABYTE® ODIN 585W 24-Pin Power Supply,
AMD Phenom II X3 720, AM3+ 2.8GHz 7.5MB Cache
ASUS M3N-H/HDMI - Nvidia GeForce 8300 Chipset
2 x Western Digital 500GB SATA 7200RPM 32mb Cache
LG 22x SUPER MULTI DVD-REWRITER LS (sata)
Transcend® aXeRam™ DDR2-1066 Gaming RAM Kit 4GB
ASUS Nvidia GeForce - ENGTX260/G/HTDI/896M - 896MB 448-bit DDR3 - DUAL DVI, VGA - Free: With Alone in the Dark Game
Vista Business
Extras - 8 GB Verbatim Flash drive & Game Boyz mouse pad for free

Sorry for the late response, been busy on client site for few days.
Thanks to all of those that PM'd & emailed me with quotes. In the end I acquired a system from Game Boyz and am totally happy with installation & after sales service. System they offered as per invoice:
ATX CHASSIS - AZTEC
GIGABYTE® ODIN 585W 24-Pin Power Supply,
AMD Phenom II X3 720, AM3+ 2.8GHz 7.5MB Cache
ASUS M3N-H/HDMI - Nvidia GeForce 8300 Chipset
2 x Western Digital 500GB SATA 7200RPM 32mb Cache
LG 22x SUPER MULTI DVD-REWRITER LS (sata)
Transcend® aXeRam™ DDR2-1066 Gaming RAM Kit 4GB
ASUS Nvidia GeForce - ENGTX260/G/HTDI/896M - 896MB 448-bit DDR3 - DUAL DVI, VGA - Free: With Alone in the Dark Game
Vista Business
Extras - 8 GB Verbatim Flash drive & Game Boyz mouse pad for free