The board isn't the best and you don't have a K CPU to OC, but overall that should be an ok setup for awhile. As you correctly pointed out plutiper, you'd have to buy a new board, CPU, and RAM. That's a lot of money spent right now for not a lot of upgrade. (Unless you are also streaming while gaming.) A 4790 and 1070 should handle all games right now at 1080.
SSD sounds good. I'd get one bigger than 120GB though. I have win7 on my 120GB and it (and the programs I have to make windows fun.) uses about 60GB. I have no games on it, so if you want to put games on it you'll only be able to install around 2 or 3 current gen games at most. I have a second SSD that is 250/256GB that holds my steam folder. If you don't game a 120GB is fine. But if you want games on it you need a much larger SSD. If you aren't upgrading the board and CPU and want to upgrade to an SSD, I'd look for other toys. New Keyboard/mouse? Speakers? Chair? monitor?