If you're going to buy a Surface, buy the Surface Pro. Period. (And buy the 128GB model.)
But if you're going to buy a $900 tablet, get the decked-out iPad with LTE and 128GB of storage, and if you're going to buy a Windows laptop, check out the Lenovo IdeaPad Yoga or the
Dell XPS 12.
Which leads me back to the same question Josh asked about the Surface RT: who is this for?
Even a well-executed Surface still doesn't work for me, and I'd bet it doesn't work for most other people either. It's really tough to use on anything but a desk, and the wide, 16:9 aspect ratio pretty severely limits its usefulness as a tablet anyway. It's too big, too fat, and too reliant on its power cable to be a competitive tablet, and it's too immutable to do everything a laptop needs to do.
In its quest to be both, the Surface is really neither. It's supposed to be freeing, but it just feels limiting.