Check out
http://penny-arcade.com/news/post/2014/05/23/surface-pro-3, they've fixed many of the problems gabe pointed out (helps that Lynwood is near Redmond). I suggest trying one at a store somewhere.
The 10" with an Ntrig might be a better bet because if it is more portable. Otherwise, not many win tablets still have styluses (especially the Wacom resistive kinds).