I've kept Isis hippuris before. IME, they're hardy and easy to keep, though they take a little while to settle in (this has been my experience with gorgonians in general). They're beautiful--one of my favorite species.
If you're looking for a colorful PS gorgonian and don't care about mixing Caribbean and Indo-Pacific species, the purple Plexaura flexuosa that have been showing up on DD lately are beautiful. Deep purple with cream polyps. Put them in steady, laminar flow (without battering them) and good light, and they'll open right up.