Dell e521 need help

[Diesel-man3000]

Ok i want to upgrade my system and its a dell e521 so i want to know if you think these psu will be okay for me to use i just want to add prob a 7600gt so i'm gonna list em and you guys put your opinion.
http://www.newegg.com/Product/Produc...82E16817182074
http://www.newegg.com/Product/Produc...82E16817182044
http://www.newegg.com/Product/Produc...82E16817182021