right now, IMO mirianae/fogo. There have been lots of rare desirable ones coming through lately, but the ones that haven't (here at least) are xingu and mirianae/fogo. And since I dont' really care for xingu as adults, that's why i say mir/fogo. Don't have a clue how much they are running.
3" 24K cereas kelberi are going for 200 and the same for 3-4" intermedia (at least from what I've seen). mir/fogo would be a step above in price, but i'm not sure what