I also recommend getting Sigma 50mm f1.4. I started using 5Dc with this as my sole lens. After using it for about a month or 2, you will probably know what others you wanna add to your collection.
And to add, the AF issue is overhyped. I had a problem when I was purchasing mine, not because of missed focusing, but because all 3 that were shown to me were sharp straight out of box. It created a bit of a "good" problem for me as a result