A 14.5 what? Ar15ish pr AR10ish rig? Eh, either way, unless you doing some sort of precision shooting or really stretching the limits of what you can do with a 14.5, I think you're looking at too much glass.
On a 14.5, I like to have a 2 or 2.5x bottom end, which the NX8 can do, but you're...