Two quick points if you don't want to read the mini-novel I'm about to post (I want to warn you about something I learned the hard, expensive way):
- A £400 computer can be shocked to death by a £9 power supply that didn't filter a power spike.
- Hook yourself to your computer with a grounding strap!
I think both LeeJend and I are like-minded when it comes to PSUs. Since I'm lazy, I'll just copied the following from a previous post
And I'll suggest a few brands to take a look at.
If you have a sweet PC, why send it unstable power, you could end up shorting restistors, blowing capacitors, and just give yourself an unstable experience overall? These can occur catastrophically, or they can just be a slow, steady drift of instability over a period of time.
Think of a power supply as the equivalent of a "heart" in your computer, because it feeds power to every single component you have. A bad heart doesn't pump blood as well as it should, and can cause problems for other organs...
Likewise, a cheap power supply will not be the best thing for your expensive computer components. Raidmax/Powmax power supplies are excellent mid-level parts, and they only run about $40-60 USD. They filter that nasty AC coming into your system far better than a $15 power supply would.
If you want to go high-end, Kingwin, Enermax, Antec, and iCute are what you would want to choose from. Raidmax/Powmax supplies are almost as good and cost half as much, though.