I like tiny, unusual fish. Some of these aren't all that unusual, but I don't have them. If money, expertise, and suitable tanks were not a problem, I'd have:
A pair of <i>Doryrhamphus excisus</i>
A school of <i>Pseudanthias ventralis</i>
A small group of <i>Tryssogobius colini</i> (I don't even know where to find these!)
A pair each of <i>Nemateleotris helfrichi</i> and <i>N. decora</i>
A <i>Plectranthias pelicieri</i> to round off the deepwater beauties,
A group of <i>Apogon gilberti</i>
A group of <i>Apogon luteus</i>
A group of <i>A. parvulus</I> (hey, why not, while we're talking wishes)
Some <i>Assesor macnelli</i> and the greenish variant of <i>flavissimus<i>
And a pair each of <i>Synchiropus splendidus</I> and <i>picturatus</i>.