Agree, if you're going to add some sticks in the future, then add another 160, if not a couple more. I know there's another reefer here who has five 160's over his tank (90g I think?) and his tank looks great. You always have the option of adding T5's too. My rule with single point source light is one light per 12" to 18" of coverage (for sps). For a mixed reef, then 18" to 24" of coverage.
I have two AP700's and a single 360x over my custom 90g and I'll eventually flip out the 700's for 360x's (total of six when I'm finished). This will allow me to move the individual lights exactly where I need/want them.
Nothing compares to the shimmer of these lights, except halides.