which sps corals to add!

I was thinking about adding some Sps corals in my 55gal! Tank: 55Gal Lights: T5 HO 2x54w What are some easy to keep sps corals what will do well under my lights. I was thinking about adding another t5 ho 2x 54. But thats if i get to it, but for now; im looking for some hardy sps which will...