Had a look at PC Per's Hardware Leaderboards and playing around with Ascent's PC Builder... so far got this;
Is 500W going to be enough? As well as the above items I'll also put in a 2TB hard drive I have and a DVD ROM.
There are a lot of options on RAM, I don't plan on doing any overclocking.
Never herd of EVGA brand for the GPU, just was one of the cheapest GTW 560s...