DDSlim..
I upgraded from my DC16 Animal to the Dyson Digital Slim, and have no regrets. It was expensive, but it's so cool and versatile that I find myself constantly using it. It's not a deep cleaner, but as Jack said, it does an good job surface cleaning carpets, and kicks ass on bare floors. I love how I can run the small nozzle around furniture and in cramped hallways (or vacuum rooms), and it can get anywhere! The battery life is fantastic. I can thoroughly vacuum my car out with it, and still have charge to spare. Its unique design constantly grabs friends attention when they see it docked in my hallway.
I do have a couple small complaints. The aluminum wand scratches very easy, so may God help you if it rubs on the underside of a couch during an ambitious cleaning. The wand fits in very tightly, and it takes some effort to switch up all the neat tools (but it's worth it for the versatility). Only other thing I've noticed is the filter gets dirtier more quickly than I would have expected (sand makes it past cyclones), but considering how frequently I use it, and how much fine dust it picks up, the cyclones do a very respectable job (I still haven't had to wash the filter, just swept it off once).
I am incredibly happy to have it around! Also that commercial does an excellent job conveying the vac's strong points!