Proper Power Supply

I am going to be building a relatively cheap web server with an i3 processor and integrated graphics. I will not be doing any gaming on it at all, it will have 8GB DDR3 RAM, and no more than one HDD. How many voltage/watts of a power supply do I need? I know pretty much everything for the build but not a clue about power. Thanks!

Edit: It would probably be best for you to just recommend one for me to use. Note that I am on a MicroATX Motherboard.
 

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