while I love dendrophyllia and realize that it fits the "rare" category, I think that a lot of people, myself included, just can't really cater to the fact that it needs food almost every single day.
suggestion for the chalice: the orange sherbet you have listed right now; holy cowwww.
shrug on the frogspawn; for some reason they never really did "it" for me.
duncans aren't really rare or hard to find these days imo; i might be biased on this one since I already own a good colony
Id take another though.
edit: how about a good micromussa? or a really nice favia?