Acros are spectacular but these are some of my favourites
Goniastrea and Leptastrea grown from a few polylps on some live rock (also have some Porites that arrived this way).
Turbinaria - arrived, dumped on top of reef while unpacking, remembered a week later and was thriving despite being almost directly under a 400. Grown a lot since then and now needs trimming.
Echinopora quietly grabbing more real estate. Glad I gave it plenty of space to start with.
Interesting new arrival, have wanted a Mycedium for a while and now it has a prime spot down the front.
Steve