I am gonna go and buy 6 more hard drives for my server, but I don't think it's current PSU could handle it

currently it has-
http://terra.chuui.jp/phpsysinfo/
300W PSU and like 5 case fans

any recommend a good PSU?
I was thinking about getting one of these cause they are cheap
http://www.newegg.com/Product/Produc...82E16817153023

thanks in advanced,
Byan