For a BOV, I would get the Synapse.
I understand people's reluctance to believe the claims they make in the video, but I fail to see why that would steer people away from the BOV. To me, the Synapse seems to make so much more sense than any other. There is no tuning required, no shims, no springs, no knobs to turn. You simply install it, and it functions properly. The videos showing it in action are pretty impressive, HP gains aside. Just seeing how fast it reacts is enough to sell me.