My bad, forgot there was 4 slots on the board. I will blame it on tiredness. I will however go with the 3 cards are a waste. Scaling over 3 cards just doesn't work very well, to the point that several games don't even run with a 3rd or 4th card installed. This I'm sure will change over time with the newer API's, personally I would run 980Ti's over Titans.
Other than that, build is looking good, look forward to the next instalment.