Rock,
I would ditch the UGF, just stay with the cc if you want. That said, sand is much easier in terms of maint. You don't have to hoover up the gunk, and it keeps nitrates down. But really it only matters how you want your tank to look, and how much time you want to spend in maint. If you are going to get corals, I would definately address the lighting issue. Lights depend on what kinds of corals you want to have. I have only pc lights, but I don't have any sps corals or clams, just lps and two anemones. As for circulation, just make sure on the hex tank you have some ripples going across the top all the time for gas exchange. That can be a problem with hex tanks, the lack of large surface area. As long as you are moving the surface water constantly, doesn't have to be vigorous, just ripples, you will be fine. Upgrading the lights will get you on track for corals, and a little more lr wouldn't hurt. Sounds like your tank is coming along nicely.
I forget, what is 0861? FO? FDC is 0844 right? I was 0811, GO GUN BUNNIES! Mike 1/11 and Echo 2/12, got out as a Ssgt in '92. billyv is former Marine too, he was HMX 1. There are a few of us here. We even have a Doc, Coop21 was a corpsman.