I'm looking to get a new PSU....

I recently purchased a 9800GT and realized that I need a bigger PSU then 300W lol. I never really put in a PSU into my computer so I dont know much about them. Can anyone give me any suggestions for good PSU's that arent alot of $$$. Also, is it like one size fits all sort of thing, or do I need a certain PSU for my computer?

http://www.newegg.com/Product/Product.aspx?Item=N82E16817139001

That's a great psu.

Here's a nice cheap psu. Works very well too.

http://www.newegg.com/Product/Product.aspx?Item=N82E16817153052

http://www.newegg.com/Product/Product.aspx?Item=N82E16817182031 Half the priceSTAR_Admiral

Less than half the quality.