Power supply is only to big when you can figure out some way to use that power. If you know of a way that you personally could use all of it, then you need a biger one. You tend to hold onto a powersupply for a few years so you collect other components and add them on. Talk to some of the guys in here. They kept on collecting stuff in their case until they got 6 hard drives all scsi and massive overclocks with the peltier cooling systems. They didn't start that way but added overtime. Plan ahead because that may be you in a few years. 350 is good for almost anything i could personally afford in the next few years.