Thanks Nebthet! I might keep a few things on the sand, but I've never been a fan of the cluttured sand look, so I'll keep it mostly on the rock. I've never had any acans (never really caught my eye), but I've seen some really crazy ones come into the local stores lately so I might get a colony or two for the edges of the rockwork. As for chalices? The only one I like is the watermelon chalice, so I might get a piece, but more likely than not. SPS all the way!
Yup, this is the arrangement I'll be keeping. Once I got something I liked, I just filled the sand around it.