I need some helping picking out a clittoral stimulator for my wife. She's very particular with how she likes to be touched, and normally doesn't like vibrations down there, just something smooth gliding up and down. Any ideas? It could be a vibrator, and I could just leave it off and then have the option later when she wants it. Any ideas?

P.S.: She knows I'm getting one for her, just not which one, so I wanted to pick out a good one. Thanks!