+1 with Ricordea, Palys, and/or Zoas. Zoas were my first coral and I still have them (5 polyps turned into 200+ in a little over a year) However for a tank of your size, you definitely need more lighting power. I would look at a 4 bulb T5HO if you want to get into coral along with some water movement (like a Hydor Koralia Nano powerhead or two). If you are going with soft coral, you don't have to worry about your Alkalinity, Calcium, Magnesium so much - it will fall into line as long as you are using a quality salt mix (like Reef Crystals) and have nothing building skeletons in your tank.
To get started with coral, upgrade your light, get a powerhead, and use a quality salt made for a reef tank mixed to the proper salinity for coral around 1.025 to 1.026. You can go from there by getting quality testing kits for Nitrates, Phosphates,t Alkalinity, Calcium, and Magnesium when you get more coral - I suggest Red Sea or Salifert since they are high quality and inexpensive (Don't get API - they are garbage). Don't worry about your pH - chasing after a certain pH level is futile and drip-style tests are TOTALLY inaccurate, get a pH reading pen or probe if you really want to know what it is. As long as your Alkalinity is correct and you aren't using something like a calcium reactor, your pH will be fine. Messing with pH by itself and trying to make it a certain level will almost certainly do more harm than good.
