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#11
Would help to know what you have before spending any money on one. Also might be a good idea o give this a read,
Power Supply Information and Selection - Tech Support Forum
before spending anything. A cheap power supply isn't what you want, a good quality one is what you are after. In a lot of cases a good quality 400-500W power supply can and usually is better than a cheap 600-700W.
Also to give an idea of what to avoid in a power supply,
The Bargain Basement Power Supply Roundup Review