If all you need is a stocker 250W, you can just pick up a cheap higher rated wattage one (the cheaper ones never put out what they said they will), or get a quality 300W.
Cheap = Name brand you've never heard of.
Here is an Antec, probably one of the better quality ones:
http://www.newegg.com/Product/Produc...82E16817371003
And one that I use (just in a 600W version)
http://www.newegg.com/Product/Produc...82E16817159022