My .2 on your lighting.... With your Scape I think you'll be more than fine with what you have. Unless you're looking to grow SPS at or near the bottom then you have enough power in those 160's. Those new Tidal Gardens frags will love it if you get your intensity up towards 80% so longs as you have a little No3 in the water.
If you're considering upgrading now then you might as well go ahead and do it. Otherwise you'll always be wondering "what if" or "should I"?
I'm on my 1st ever tank and I started with (2) 160's. I made that decision based solely off of Nathan Willards tank. After a few months I added a 360 in the middle of the 160's. That was cool and definitely made my couple SPS pieces happier. In hindsight, had I just cranked up the 160's i probably would have had the same result. But hey, I'm an Newb and what did I know? LOL I was afraid of killing corals having no prior experience.
A couple months later and many, many T5's rule threads read I decided to go for a highbrid setup. I'm loving the setup I have now but did I need it? Probably not. I'm a tinkerer by nature and have resigned myself to knowing I'll always be messing with something. Patience isn't a strong suit of mine but I'm learning, Mostly the hard way