hey guys my friend is building a new system with an i5 760, hd5850, p55a ud4p motherboard and 4gb g skill ripjaws ram, he plans to crossfire in the future and he plans to overclock, he already has a gigabyte odin 720 watt psu and he knows its not 80+ certified and so on, he wants to know if he would be able to do all of that on his existing psu? and if not what would you guys recommend, he was looking at some antec and corsair psus he doesnt want anything overkill he just wants something that will do the job what do you guys think?