Have you looked at the Surface? Penny Arcade has had pretty good things to say about it but there have been plenty of other reviews as well.

http://www.parkablogs.com/picture/review-microsoft-surface-p...

https://www.penny-arcade.com/news/post/2013/02/22/the-ms-sur...

http://www.windowscentral.com/check-out-artists-perspective-...