I would say try to add an SSD. Awesome pieces of tech.
And you really need to think about your psu (power box to you)... never heard of thermaltake (new to all this anyway) add another 10 more $ and you may be able to get a seasonic or a corsair make, and beware, those new AMD GPUs apparently run quite hot. So a not so good make of PSU my crap on your (IMO) lovely looking PC.
I agree. Get an SSD. It will make your whole computer a lot more snappy. That is what I used when I built mine. I will never go back to just having a hard drive.
I use the SSD for the OS and some games, I still have a hard drive for movies and music/files.