WELCOME TO THE ADDICTION!
It sounds like you have the basics covered but may I suggest that you make the investment on a few key pieces that will make your life much easier down the road.
1. Skimmer. This little gadget is worth all the money you can afford to spend on it, ESPECIALLY on a smaller tank. Buy the best, and biggest, you can afford.
2. Heater. There is nothing worse than coming home and seeing boiled Lionfish, or worse..boiled reef, in your tank. We invest considerable amounts of money in the live stock...it would be foolish to skimp on the very things that keep them alive. Again...buy the best you can afford.
3. Lights. Once you decide to go reef...buy the best you can afford. (but thats down the road for you).
Also, buy a few good books. The Conscientious Marine Aquarist is an excellent one.