Yeah, you're definitely going to want to stick a good SSD in there. I recommend the Samsung Pro line as well, 256 should be about right.
Stick with the Pro line, the Evo is pretty meh.
But with all the computing power you've got in there between the i7 and the GTX 970 that 1TB HDD is going to be a bottleneck.
If this were my build, and it's pretty similar to my last big budget build, I'd swap out that fancy WD black hard drive for a standard WD blue for 3/4 the price and then add an SSD.
Only other thing I would recommend is a bigger PSU. 650W seems a little light.
You've got the MOBO and the GPU to go SLI with a second 970 in the future, but that PSU just won't get you there, so if you want the second 970 you'll also be forking over another $100-$200 for a new power supply at the same time.