The case can fit a standard ATX power supply. The PSU choice can be confusing. I only recommend name brands, something I'd use in my pc. The question are what is your budget & where do you shop? I'll give you something to start with:
EarthWatts wins hands down in quality dept. You can't get it brand new at that price without shipping anywhere else. However, Sparkle has a 120mm thermal-controlled fan. Gen-speak, the bigger the fan, the quieter is.