unfortunately your MB only supports older Phenom II and Athlon II CPU's 95W and under. If it would have supported it, I would say put in a Phenom II x4 965BE and a new video card, but it doesn't. any other CPU upgrade that you MB supports, would not be worth the cost. So, on £150 budget I would just go with a new GPU.
Not knowing how robust your power supply is, I will error on the side of caution and suggest this one.
Hello, thanks very much for the feedback.
I have done a little investigating and opened up my computer to find the out more about the power supply. Majority of the writing on it was in Japanese or a similar dialect. However, I have tracked it down to this:
I was mistaken, as in fact it is 420w. I do not know if it has a PCI-e connector, maybe you would be able to establish that.
I think you are very right in the fact that I need a new motherboard, and I quite like the Asus that you recommended, as i would like to stick to AMD. Although, I am thinking of buying a new PSU, as my current one also limits upgrades in the future.
I was wondering if you would be able to recommend a PSU and motherboard for me, I don't really know the ins-and-outs required to make an informed choice.