I have the I2. I like it, but I think the I3 would be a better fit for my game. Maybe for yours too? The I2 has a nice feel to it, though you have to get used to the extra short ferrule. You can't beat the McD lifetime warranty, even against warping.
Never played with a 314 or OB so I can't say anything about those.
Hope I helped a little. Good luck in your search.
Craig
well just to put yet another twist on it, I love my predator shaft, I think a lot of it is personal preference. I-2 versus 314? I prefer the 314, but I've never hit with an ob1.