Leucs are fairly loud, but they call in the day so they won't wake you up and it's a nice cal. Auratus are very quiet, and just about all thumbnails species (which would use the vertical space well) also have a pretty quiet call. Anythonyi also have a nice call, it's audible like a leuc's but not annoying loud. Josh's Frogs is good, they will help you choose some good frogs if you decide to buy from them.
Goodluck with whatever you choose, just remember to practice culturing fruit flies ahead of time so you can get practice doing that if you choose dart frogs.