What exactly is the 1700 "worth it" for? Given the OP hasn't really elaborated beyond "work", we can only assume.
Not saying it isn't more beneficial to the OP, but without more info, you can't definitively say the 1700 is "worth it".
As for the Force LE, yes, it's a budget option. But when considering a budget SSD vs traditional 7200rpm HDD, it's going to be night & day.
Needless to say, the 850 EVO is a quality SSD, and well worth the additional 15; but outside of benchmarks, the OP is unlikely to notice any difference between either of the two.
I'd suggest a mATX case for a build with a mATX board. Not that a full case won't work, I just think it looks a little funny, personally.
Good find on the Zotac 1060.... when I looked, the Inno3D option was the best, but now it's not even available at the price.