Your favorite Recommended reef safe critters

[Aphyosemion]

I am in the middle of stocking my 40 gallon tank with the long awaited critters that I have shelled out all that money for. It is a 40 gallon breeder with a deep sand bed and 30 lbs on live rock on 30 lbs of base rock. It has been up for something like 4 months.
So far I have a flame scallop, 3 margarita snails, an orange limpet (very cool), and a black, shortspined urchin. There are also about 5 fanworms that came on the live rock as well as a multitude of sandworms and peanut worms.
My question is what do you all recommend for reef safe critters for a small tank like this? I wanted hermit crabs originally, but I don't want them to murder my snails. The last couple of things I was thinking about getting were:
3 neon gobies
1 reef-safe starfish...of some sort.
1 lawnmower blenny (optional)
1 yellow head jawfish or sand sifting goby (optional)
1 oyster or barnacle (assuming I think I can keep it alive)
The only food I add to the tank right now is a little bit of zooplankton and phytoplankton mixed from a bottle for the scallop and fanworms. Also, the fish are secondary to the inverts. This tank is primarily to enjoy the things I couldn't have in freshwater tanks....except for the snails.
-Aphyosemion

[ChrisPrusha]

Scarlet leg hermits are fairly safe with snails, although I think hermits are more cool to look at than anything else...I wouldn't say they are bang up cleaners. Lawnmowers have great personalities...one of my faves! Sand sifting gobies are very cool, too...I have a yashia and pink speckled goby, both with a pistol shrimp buddy...what a blast to watch! The others I can't speak to, although some will say a 40g is too small for a linkia type star.

[Tim224DT]

I have two yellow watchman gobies in my tank. They are the coolest guys to watch. They took about 2 weeks to get used to people walking up to the tank and now they are always out playing around.

Tim

[VWD]

I like large turbo and blue leg hermits. I have a 150 gallon with 12 turbos and 30 blue legs. The tank is clean. But I also do regular water changes , have few fishes and use RO/DI water. One more thing I feed about everythree days.

[Loverotties]

There are so many but my fav.are the gobbies!!

[Aphyosemion]

I was actually thinking of some sort of sand sifting goby, but I'm not sure which one would work for my tank. I want to keep the overall bioload on my tank low, so it couldn't be a large one.

Also, I almost bought a lawnmower blenny, but the word is that they stop eating algae as they get older and are kind of belligerent to other fish. Is that true?
Also, pistol shrimp/goby combo would be sweet, but I don't want the shrimp to snag my neon gobies, which I hear they may do.
It has been difficult to find just the right invertebrates and fish that will all live in harmony without eating or harassing each other.
-Aphyosemion