Here's an example of why you might as well, $25 for a good brand after rebate. Its only 330W on the 12V rail but I doubt yours is actually 250W anyway. Not recommending it at this time, still don't know you're budget/Res/GPU needs, and need to match PSU to those. Just an example that for 25 bucks why risk blowing up your system.
After researching a little further into it. It appears my graphics card is absolute pap, whilst my other specs should work well with recent games. The main problem I'm having is determining what GPU is compatibale with my motherboard and then if it is compatible with the PSU too.