Hey there i need of abit of advice about a new psu as mine is on the way out i think shuts down randomly with no warning and struggles to last past a boot up. Currently have a Asus P5Q pro,Q6600,AMD 4870 1gig ram,1 CD drive,1HDD and two sticks of ram built it over 4 years ago. Kind of lost touch with whats what so thougt i'd come here and ask to be sure and not waste any money. PSU i've got now is a hiper 800w PSU but reading up about it seems 800w might have been abit of overkill.
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Something like this would treat you well. Made by seasonic, arguably the best PSU maker right now.