I'll give a big thumbs-up to the montipoira digitata, I keep 3 different colors under my 3x96W PC's now, growth on the purple has been fantastic. The orange has decided to encrust before growing upward, and just got the green.
The purple has been through so much abuse it's ridiculous. It's the one coral that just always gets knocked around, has fallen on my frogspawn, torch, bubble, etc and always grows back tissue at an incredible rate.
Possibly as hard to kill as shrooms provided enough light and calcium.
So while you're upgrading etc, you can definitely start with some nice digitata and see how things go.
Travis