I don't think I'd go for a full-sized tablet at 1200-1500. Too expensive and too big to carry around.
However... One of the things I'd be really interested in if the price was right, would be something with a screen the size of a hardcover novel but extremely thin and light. Like an e-book device, but with the added abilities of a pda.
Here's how apple could leverage their technology to make this a seller.
1) Get partnership deals with as many different ebook vendors as possible and create iBookshelf app with central repository for all your books, magazines, etc.
2) Build firewire into the device so it can connect to your iMac.
3) Via rendezvous, you plug it into your mac at night, when you wake up in the morning, your new york times, etc. etc. is in the "EBook"
4)A sherlock-like search engine would automatically cross-reference all your news. You read a story on corporate fraud in the NY Times, and a simple click takes you to the corresponding story in the Wall Street Journal.
5)While reading on it, you get the urge to take notes... done via inkwell.
6) Rolodex? Yup. Calendar? Yup. To Do list? yup.
And one more thing.
7) Automatically syncs with iphoto so you have your photo albumn on the go. You get to work, put the unit standing up on your desk and there's your wife's picture.
Oh, and one more thing...
8)With rendezvous and bluetooth, it could check email on the go by rendezvousing with your bluetooth cell-phone.
There are no other comparable devices in this space. The Franklin eBookman has the pda functions, but the screen is crap. The Gemstar device has a great screen, but no PDA functions. None of them have anything like sherlock. Nor iPhoto. And wireless e-mail? Totally unique. Also, the process of getting info into other e-book devises is cumbersome, to which Apple could apply their simplicty magic.
And finally, the market demographics are the same. The people who are buying e-book devices, are the same people who are buying Macs, are the same people who are buying high-end PDAs.
If they could bring a device like this to market at around $700 I'd buy it in a heartbeat.