Mystery snails are very fun in my opinion and lay their eggs above the water line, so try are easy to remove. They also need a partner to lay, so you could get one and not worry about it at all. They also CAN be sexed, though it can be a bit tricky. I have 4 I bought from a member on here, peachii, and while the two small ones haven't really been properly sexed yet I think I may have all gals.
Nerite snails will lay eggs in freshwater but they never hatch (I've heard rumors of RARE instances but as a rule they don't). They are great algae eaters. The eggs are a bit annoying as they look sort of like little sesame seeds scattered all over.
You could get one or two of either of the above and keep the population from growing.
MAlaysian Trumpet Snails (MTS) are great for cleaning and aerating the substrate. They reproduce easily and fast if there is a good environment (of you over feed especially). The females can produce clones so you only need 1 to reproduce.
Ramshorns can also be cool, but also have the potential to breed like mad, if that worries you. And I doubt you would be able to find and destroy all the egg sacs laid.
I love snails! I have MTS, Ramshorns, and my fav, the Mystery snails! I also have some unwanted pond snail hitchhiker babies who I have been smooshing when I find them on the glass.