what is the best video card for a 300w psu?

It should power all the cards listed on newegg that are 9", as long as you don't go overboard with other components.
 
It might run all cards that can fight, but I wouldn't do it. With a 350W I would only go as high as a 9500GT. Last time I checked, a 9600GT was about 9" long so I don't know if you would consider that to fit inside. I would go with a 9500GT along with a PSU upgrade just to be safe.
 
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