hi all, i'm starting to look for a new gpu and am seeing some new requirements as far as amps go. i've recenly found a cooler master v1000 for 159.99 and this seems like a great deal with ample amps. my question is this: good psu? and is there such a thing as too much wattage? i will be likely be getting two gtx 770's so i know it's hungry but what should i really be looking for?