New To saltwater, What other corals should I get?

I have only been into saltwater for about 5 months and just started getting hardy corals the about a month ago. I have a 33 gallon tank, prizm protien skimmer, fluval 205 canister filter (no sump or refug. I have nowhere to put it) heater, and hagen glo T5 HO 2x39watt lighting fixture. So far for fish I have 2 small oscellaris clowns, 1 firefish and 1 cleaner wrasse. The wrasse has been with me for close to 3 months now, I'm amazed! I also have 5 hermit crabs, all reef safe. So far for corals I have a small cluster of different colored mushrooms, a small colony of green button bolyps, a small frag of eagle eye zoas and a small isolated frag of star polyps on a small island away from my main rock placements to keep them from getting out of hand too fast.

Now, what else should I get that is easy to care for and fairly cheap and pretty looking?

 

Pulsating Zena's are pretty. It will probably be hard to keep hard corals with only 2 t5 lights. I may be wrong, but I don't think I am. We would all like to see your set up

 

ricordias are cool along with mushrooms. leathers and kenya tree corals are hardy. ever thought of LPS?

 

Any leather or softy. Mushrooms, ricordea, zoa's. Most all LPS really.. Torches, favia's, blasto's acan, and so on. Just put the LPS a little higher probably, mid level up.