For what it's worth, I really disliked the B100s. The F100s seem OK though. I don't trust the C100 or the B10s. I would say that if it's mostly just going to be you listening in the sweet spot, skip the center. However, if you will be having multiple listeners and need wide coverage, then maybe it's worth getting the center. Just be sure to run the receiver's auto-equalization system if you get the center or especially the bookshelf speakers.
Honestly, I would try the front towers to start with, and set it up so it would be easy to add more speakers down the line if you want them. But the tower speakers might be good enough on their own to mitigate the need for any other speakers.