These are the snails I like:
Trochus, tough snails with regard to shaking off crab attacks, excellent grazers.
Hawaiian turbos, smaller than the Trochus but an active grazer, they have reproduced in my tank.
Strombus, small snails that are very prolific and active.
Nassarius, detritus consumers that bury in the sand and actively come out for food.
I also have some Ceriths, very small snails, which breed in my tank as well. I also had some Nerite snails which weren't the most active snail and tended to crawl out. I've heard they also prefer cooler water, below 80 degrees.