Looking for a tablet with a nice big display (bigger than iPad) under $1000?

ASUS Eee Slate EP121-1A010M 12.1-Inch Tablet PC

The ASUS Eee Slate EP121 keeps you productive, entertained, and connected. Experience crisp, clear high definition entertainment on the 12.1-inch capacitive LED-backlit touchscreen display with finger or pen touch capabilities. Featuring a powerfu... read more...

This has a 12" display which is 3" bigger than an ipad. It does run windows,but it's your only option if you want to get larger than a 10" display. If you want an android tablet, then the Asus Transformer Prime is your best bet.

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Acer ICONIA-6120

Acer Iconia-6120 Dual-Screen Touchbook comes with these specs: Intel® Core™ i5-480M processor 2.66GHz with Turbo Boost Technology up to 2.93GHz, Windows® 7 Home Premium, Dual Multi-Touch 14.0" HD Widescreen CineCrystal™ LED-backlit Displays, Mobil... read more...

This is a cool tablet... I don't know how you feel about dual touchscreens, but it looks pretty awesome.
Good technical specifications, too: Windows 7 Home Premium, Intel Core i5-480M processor (2.66GHz), 4GB DDR3 dual-channel memory.... basically like a laptop in the specs department.
The dual touchscreen can be advantageous for some but annoying for some, too, especially if you do a lot of typing. Obviously it's more difficult to type on a touchscreen, so keep that in mind when making your decision.