I'm looking for a small PSU for a beefy mATX gaming rig. I'm guessing I'm stuck with an ATX psu (which WILL fit my case, btw) but I wonder if there is one with slightly smaller dimensions than average.... It has to be enough wattage to power a quad core and a mean GPU (or GX2 or SLi, potentially) and modular, too. Any suggestions? (The rest of the system is pretty barebones: one raptor hdd, one cd drive, sound card, one case fan.)