These are all Atom based tablets coming out now-ish.
The HP Envy X2 looks nice. Aluminum shell and the keyboard dock has a battery. Kinda pricey at $850.
The Asus Vivo Tab Smart is possibly the cheapest at $500, but lacks the active digitizer of similar models and has no USB port.
There is also the Dell Latitude 10, but I don't know much about that one.