In order of my success with them after 1 year and some rather stupid mishaps on my part:
1) Hairy mushrooms. I started with one, now have 20 or more and have given several away. Bulletproof.
2) Green palys. Likewise started with one, now have 20.
3) Cabbage leather. Has grown at least 5x.
4) Toadstool leather. Increased 4-5x in size. Seen behind the cabbage in the previous picture.
5) Kenya tree. Grows and frags like crazy.
6) Green star polyps. Had a rough start due to getting overrun by GHA. But now doing well.
7) Candy cane. Not a softie but an LPS. 4 small heads are now 10.
Many people recommend zoas as beginner corals. Personally, I had no luck with them for about the first 9 months. They are just now starting to do well for me.
Likewise, I'd wait on any euphyllia (hammers, frogspawn, torches and duncans). I'm just now beginning to have success with them too.