if you like xenia, then you are in a great position, because you are going to have a lot of it very soon!
seriously though, if you like xenia, then that's what i would recommend. i personally am a fan of LPS
. duncans, candycane, blastomussa, lobophyllia, dendrophyllia. they don't grow as fast because they build a calcium based skeleton, but they never cease to impress me.
what about zoanthids? they can cover a rock. if you buy some high end ones, they are worth big money when you are ready to trim back the overgrowth.