Any reason not to start out with a couple used ap700's instead to save some cash? I know led deterioration is a thing, but for an early tank, I don't see the loss of par affecting the tank negatively. And it comes in at less than half the cost. With lots of people upgrading, this is something to consider. I have thought a lot about upgrading my 2x ap700's or adding to them and I keep coming back to the same conclusion that the ap700 is a really good light. I only run it at 80% peak for an hour or two a day, so my time cranked up isn't that long, and it is nice having the small footprint of the two lights so I can reach inside my tank easier. I am pretty sure that the ap700 is just 2 of the a360's put together.
Edit, I just saw this is for a "new" 100 gallon. I update my recommendation to 1x ap700. I think you'll have plenty of coverage and will look very clean with the single light over the tank.