I'm currently using a 203w 17 amp Xbox 360 power supply and it works well for my printrbot setup. I'm not sure if your setup requires more though. Mine runs both and has really good protection. It has a 5v and multiple 12v lines. Just a thought you can pick em up cheep. It will say on the back so make sure you get the 203w version if you go that route. I got it for $5.
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