I'm looking to build a simple little box to run in the corner 24/7 to use as print/file/minecraft server and what not. I'd like it to not take up much space, or take much power (kind of the idea of an HTPC). However I've only ever kept up with high end gaming hardware. I don't know where to start when concerned power and efficiency. I've been reading about ATOM processors, and low power AMD processors, but haven't found much info. What size of power supply should I be able to get away with? Sub 300 watt? Would an ATOM run something like minecraft for 6 people? Do WD caviar green drives work well for raid? So many questions my head is spinning. I found a few pages in my googling where people were building cheap, low power systems, but they were all from a few years ago. I'd love some advice!