I personally only use clit toys as of right now, but my favorite is the high intensity bullet. It is discreet, has some powerful vibrations, and fairly quiet.
Sorry I couldn't be more help, but I just haven't had the funds to get a rabbit, which will be my next step. Sorry I couldn't be more help. Oh, I did have a sparkle vibe, it wasn't as quiet, moderately powerful, and not too big. Hope that helps.