I'm not terribly fond of the idea of a 10" tablet. While they seem good, they're really not. Once you get above 7", you're starting into netbook territory. And once you get above 10", you're into laptop territory. Honestly, if I want to use something that's over 7", I'll just go grab the equivalent hardware that already exists. For one, it's cheaper. Two, it does a heck of a lot more. Sure, 10" is awesome if you're reading ebooks or watching video, but if I'm carrying a tablet, I want to surf the web. Think of Nokia's n8xx series. They were awesome for exactly that.
My perfect tablet would be 7", come with a stylus, and be primarily focused towards multimedia (ie, movies and music/audiobooks), ebooks, and web surfing. One thing I don't want on my unit is 3G. For one, it locks you into a single phone network, which sucks beyond words. (Go look up information on vendor lock-in on the cellular networks. It's not a pretty picture. It's honestly as bad, if not worse than DRM.) Two, it's just easier to tether off your phone than have the device do 3G on its own. And finally three, 3G is a battery eater. So avoid it like the plague.
Also, I like resistive screens over capacitive. Why? Think back about my comment regarding the stylus. I'm not likely to have my fingers smeared all over my screen. I'm a neat freak when it comes to screens, and fingerprints or any kind of dirt on a screen drives me nuts. That's one of many reasons I prefer a stylus, and resistive screens. Now if you're going to be knuckle deep into your screen with all your fingers, that's a whole other thing. I however won't be, and thus I don't need it. Sadly though, if you put me into a room full of people, my argument would probably lose at a staggering rate of 99 out of every 100.