Well here's what I usually keep in my 14G:
5 nassarius snails
5 Trochus snails or Astrea snails (depends on what is available when I'm redoing my setup - if they get too big, which they will over time, I dump them in my 155 or trade them in to my LFS for small ones again)
3 Mexican Reef Hermits
1 Skunk Cleaner shrimp or Fire Shrimp
1 Pom Pom Crab (because I think they're cool - completely not necessary to keep one)
3 Bumblebee snails (don't get them unless you're positive they're the kid that won't eat other snails/corals)
1 Peppermint shrimp