http://www.blowfish.com.
Not affiliated. Just a satisfied customer. I'm fixing to place my second order from them right now. My girl needs a collar and maybe some wrist restraints.
<a href="http://www.blowfish.com/catalog/guides/vibrators.html">Here's their "how to choose a vibrator" page. Very comprehensively done, from the total newbie's point of view.</a>