Wizard - not for the top speed, but for slower runs its pretty cool. I wouldn't bother with the equip.
Dandy lion is fantastic, lets you run a *lot* of buffs. Is my main item drop familiar.
Goodfella is pretty good too, full weight volley + barrrnacle, that means you can adventure in harder areas and it delevels the monsters. And the contracts, oh yeah.
Troll is kinda 'eh' now, because the MP/HP gains are pathetic and rare.
Green pixie rocks for the !pipes, and if you have your MP solved you can use it as a main item drop familiar (if not use the lion)
Hobo is semi-good (if you have spare booze), badger is crappy (sorry Beni) and so is Comma.