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Where should my money go next: savings, investments, retirement, or my mortgage?
I'd invest in yourself.  Start up a side business.  Take a certification class that gets your foot in the door for something else (auctioneering, real estate sales, whatever).  Bid on a storage auction and try to re-sell it.  Learn Spanish (or whatever second language is best for your area).  And so forth. Most of the suggestions thus far are either debt reduction or passive investment.  You have good control on your debt, and most passive investments pay jack (though Lending Club might be a bit better than most).  Build up another basket to put your eggs in and build equity and cash flow instead of interest and dividends.  You're young.  This is the time to learn how to do it.