Don't get me wrong... I love crabs! (Did that come out wrong? I do a lot of spot feeding so I have to constantly sheww them away from corals that are slow digesters.. They come up and try to peel them open like a candy wrapper... hahahaFunny...I prefer crabs to snails! hah hah. Snails always seem to fall over and die.
I do however agree that nassarius are awesome. I also like turbos but they tend to knock things over, which isn't a huge deal if everything is epoxied down.
My favorite crabs are the blue legs. Don't get mithrax crabs if you want corals.