OK, well after taking into account the constructive criticism from everyone (thanks a TON!) I have modified my build to this:
GIGABYTE EP45-UD3P
ATI RADEON HD4890
ANTEC NINE HUNDRED 2
INTEL CORE 2 DUO E8400 3.0GHZ
Corsair TWIN2X4096-8500C5D 2x2GB XMS2 Dominator
WESTERN DIGITAL 1TB 7200RPM 16MB SATA2
PIONEER DVR-115D MULTI-FORMAT 20X DVD WRITER BLACK BUNDLE NERO 8
GIGABYTE 800W ODIN GT POWER SUPPLY
Windows Vista Home Premium 64bit + free W7 upgrade
Once again, if anyone notices anything wrong at all, PLEASE let me know :)
Cheers everyone