I am thinking of buying a UPS for my mac pro. It has 2 HDs and a 20" will also be on it. I want one that has software for mac. I don't need much run time just long enough for it too shut down and thats it. What would you guys recommend. I don't want something terrible expensive. The power voltage here is very good so i don't know if i need one that regulates voltage as my voltage here is just fine.