I've been eying off a Gigabyte tablet with Win 8 full OS for $665 AUD. This model has a 64gb SSD, but there is another for $640 with a 500gb HDD, and another for $713 with more RAM, a 64gb SSD and a HDD.
It'll be a while before I look to actually buy one, though, given I've just purchased a new 27" monitor and a 4 bay HDD enclosure to upgrade my desktop setup.