You plunk down cash for a plasma TV and an iPhone 5, why not make a similar investment in your at-home oral health? What we have in mind: the Sonicare DiamondClean rechargeable toothbrush ($220, philips-store.com). The tooth-polishing powertool cranks out 31,000 brushstrokes per minute, which would take you a month to rack up with a manual brush. The DiamondClean is touted to remove five times more plaque than a manual brush, whiten teeth in one week, and improve gum health in two weeks. It also features a two-minute timer and a USB cord so you can charge it up at your computer.