This wasn't too dear, but its good enough performance for a good few years anyway
CPU: Intel Quad Core i5 3570k 3.4GHz OC'ed to 4.6 Max
Motherboard: Asus Z7787-X
RAM: 16Gb 1600MHz Dual DDR3
Graphics Card: Nvidia 2Gb Geforce GTX 650 Ti
Power Supply: 650W (Can't remember the make)
Any Other comments: InWin Black Dragon Rider Case, Logitech K200 Keyboard, Logitech B110 Mouse, HDD 2Tb Seagate internal (I am going to install another 2Tb that I took out of my external, and then my 320Gb Laptop HDD too)
As far as the 16Gb goes, I've used about 8 quite a lot, so I feel its useful for me, as I dedicate more RAM to improve game performance even more, plus the overkill means it runs smoother