I actually just really started getting into Zoas. There is a guy about an hour from me that I found on Craigslist who sells Zoa frags CHEAP! So I've taken the trip a couple of times and got some nice ones. Which I'll post some pics later because the lights are currently off. I've actually found some great deals on CL. And that is the only place that I'll buy Zoas from because I think that it's crazy that some places try to charge $10-$20 per head.
As far as favorites, it's hard. There are so many beautiful ones out the. I just got a God of War frag over the weekend. I'm keeping an eye out for some Fire and Ice as well as Darth Maul. Even the Space looking ones are awesome! I could go on and on.
One thing that I'm curious of is how peoples tanks look with Zoa colonies. I have a number of frags throughout my tank and I always try to envision what it'll look like when they spread. If there is a thread about that, please share. If not, I guess I'll start one.