Here's an interesting trick. If you have an iPhone 5, try holding it in one hand in landscape. The iPad mini is a little less than 1/2″ wider than that. However the ipad mini is also ever so slightly thinner, and has a curved back. So all in all it should feel roughly similar in the hand (in size, not weight obviously) as does the iPhone 5 in landscape. I like it.
iPad, of course