Why would you say that? I have seen quite a few nice SPS tanks that had isolated spots of xenia and it was nice. As long as you control it, it can be a great easy coral that adds nice movement to the tank. Another plus is you can easily frag and trade it or some LFS will give you a small store credit for it, can't beat free LFS credit from growing an easy coral.do not get xenia, ever.
My tank isn't new at all. it was up and running 5+ years before I got it. When I bought it, I transfered all existing water, filtration, sand, live rock, and a couple fish with it. It's been up and running in my own home for a year now.With your tank being new and still having detectable ammonia and nitrites, I wouldn't recommend corals quite yet.. but when you do I would go with any of the bottom 4 on your list as those are the easiest and most hardy. If you want the most movement then xenia or a torch coral will give you that. First 2 on your list are a little more delicate, especially the elegance. But if it were me picking my favorite out of your list it would be the elegance. lol.