I really enjoy my cutteri, such spunk at 1.5"! As you can tell by my sig I love all in that genus. If I could leave my 55 up I'd be setting it up as a crypto pair tank.
I have a group of three young keyhole cichlids, probably not more than an inch, but so far I like them a lot. Festivums are cool as well. Dwarf pikes are pretty cool but they are rather maniacal.