If you're looking to keep the ram at 3200 mhz and not downgrade (althought there isn't too much difference)
Then you could look into getting these motherboards,

http://pcpartpicker.com/product/Q9Gj...herboard-z170a

or

http://pcpartpicker.com/product/QZJk...170x-ud3-ultra

^ this one IMO looks better and also has an u.2 port (but you probably won't be using this unless you get an SSD for it but they're really expensive), supports all the way up to 3866mhz on the ram. and only like $1 more

Also, one suggestion.
If you're willing to wait I would wait until Cyber Monday, as you may save quite a bit of money especially considering you're spending nearly $4k but you may find some difficulty finding some things because they may or may not go out of stock (really depends, idk) However, if you're impatient (I wasn't willing to wait like 2 months lol), then it's up to you.