At some point everyone has posted something stupid, but I wish posts asking what to mine would result in an instant suspension.  That said, the correct answer is nothing.  There is not a coin that you can mine that you will even break even.  You will lose money on electricity.  You probably got a "good price" because these things are 3 years old and worthless.  My advice would be to find a scrapyard and see what the metal is worth