The MyKey 2300 RFID door lock gives you convenience as well as security, as long as the AA batteries don't run out. The lock responds to one of six key-cards that are included in the $300 unit, opening up when waved in front of the sensor. If you forget your card, there's a slide-out keypad for you to enter in your 3 to 20 digit passcode.
And if you forget your passcode, well, you're screwed. So implant that RFID chip in your skin like you've been planning to do. If the battery does run out, you can hold up a 9v battery to it to juice it up enough for you to get inside and replace the battery. Pretty nifty device, but at $300, it may be a little steep.