If it were my tank, which are the products I have on my tank, I would go with:
Aquaclear 110: This can be turned into a small refugium. Search "aquaclear fuge" in a couple forums and you should receive an extensive list of modified filters that are very easy to construct. Media can also be used in turn with the "fuge" setup.
Two 50w heaters: I prefer Tronic due to their small size and reliability. You can place them in your filter, once modified
For a broad range of corals and even low-light sps
, you can easily get away with a Coralife 24" 2x65w hood. If you would like the ability to keep higher light corals, a T5 24" 2x24w would suit nicely. There are many options to consider depending on what corals you would like to keep.
Skimmers aren't necessary in such a small tank. I do recommend purchasing a refractometer.
Do check out wetwebmedia.com for aquarium related information and hellolights.com, marinedepot.com, and bigalsonline.com for products