Microsoft's initial vision for the Xbox One was so inextricably linked to the Kinect that the company didn't even consider it a peripheral: if you bought an Xbox One, you had to pay for the Kinect whether you wanted it or not.
So which one should you get? The answer depends on what you're looking to get out of the console.
The AU$499 Xbox One: The cheapest way to play Microsoft exclusives
One of the narratives leading up to the launch of the new consoles was the Xbox One was charging too much money for entertainment-based features that gamers didn't necessarily want.
With the AU$499 Xbox One, that's no longer an issue. If you're a gamer that's mostly interested in the Xbox One because of exclusives like Titanfall and upcoming Halo titles, the Kinect-less Xbox One bundle is the best value. Most of the games that require Kinect are fitness- or dance-based, while most other games that use the Kinect can be played with a standard controller.
And in reality, the AU$499 Xbox One is even cheaper than the $100 price drop indicates. The Xbox One (and Xbox 360) no longer requires a Live Gold subscription to access streaming media apps like Netflix, Hulu Plus and YouTube, so you'reto access relatively basic functionality. You'll still need Live Gold for multiplayer gaming, but some gamers will be able to get by without paying anything more beyond the cost of games and the standalone console.
The AU$599 Xbox One: The Kinect might do more than you think
When most people think of Kinect, they conjure up images of dance games and the ability to bark out commands to change the volume on your TV. And if that's what you're looking for, you'll definitely want to opt for the AU$599 Xbox One bundle.
But even if you think those features are gimmicky, it's worth considering the more expensive Xbox One package because the Kinect is so integral to Microsoft's vision of the living room. Aside from the camera and microphone, the Kinect sensor is also responsible for firing out remote control commands that allow the Xbox One to control other devices like your TV, sound bar, and AV receiver.
You may still balk at the idea of a AU$100 glorified IR blaster, but you're going to need it if you buy into Microsoft's vision of having a single interface to access all your entertainment.
Can I add the Kinect later?
If you're on the fence about whether or not you need the Kinect, you always have the option of buying the cheaper Xbox One and adding the Kinect later. Microsoft hasn't announced how much the Kinect will cost on its own, but at the moment you can buy a used Xbox One Kinect sensor cheaply on eBay. And since Microsoft has confirmed that there are no other differences between the two bundles other than the Kinect sensor, there's no penalty for trying the AU$499 Xbox One first and deciding whether you want the Kinect after you've lived with the console for a bit.