haha, they are certainly on my list. I've wanted some for awhile; such pretty fish, and very graceful the way they swim! I am a bit worried about them being nippy/aggressive, though.
a 30g is going to stunt a goldfish? I just dont believe that; with frequent partial water changes (weekly of 25-50%, I'm planning), good food, and good filtration (planning a penguin 350B and probably a whisper 60 or similar-sized whisper filter) I think a 30g standard will be fine for 1-2 adult FANCIES, who dont swim very well or very fast, and for the most part aren't especially aggressive- I could understand stunting worries in a 35g hex, but not in a 3' long tank! I'm sure a larger tank would be far easier to maintain, and the goldies would enojoy the extra room, but I just dont think its too small for a fancy goldfish. I will likely run the tank BB, if I do go goldies, which will increase their swimming room (not by much, but by a bit), and wont have a great many decorations in the tank, either. probably just a few plants (real or fake) to give them some shelter, maybe a cave-like decoration or something like that.
I am however re-considering goldfish just because of the sheer bioload produced by them and the amount/volume of water changes I'd be doing to keep up with it, and I would really like to be able to do another planted tank, and goldfish just dont seem to mix too well with true planted tanks (might do a few plants in pots if I do the goldies, though, or tied to driftwood/ornaments). I am really attracted to their dumb-puppy-dog behavior, and they're just so darn cute! if I do goldies, I'll probably get lionheads, or pearlscales, or one of each.
if I dont do goldies, I'm considering doing a few angels (3-4), or maybe a red tailed shark and some barbs (which would probably be a less heavily planted tank, but still), or maybe the sunfish, or the puffers. we'll see- I dont even have the tank yet!