I've had the Sonicare Elite 7300 for a year now, and I can't even begin to describe how much I love it. It makes my teeth feel so much cleaner than when I use a regular toothbrush. It gives that straight-from-the-dentist clean feeling. I also love that it shuts down automatically after the recommended two minute brushing time and beeps every 30 seconds so you know when to change quadrants of you mouth. It is quite expensive, but it is worth the investment since you only get one set of teeth...unless you wanna get dentures that this. No thanks!
**UPDATE** I've had this for 4 1/2 years now, and it's still going strong! People always ask me how I get my teeth so white and this is all I use.