Samsung is really the only game in town if you want an Android slate larger than 10-inches. The Galaxy Tab Pro 12.2 is a pricey device, though. The retail figure is $649.99, but it usually sells for $549.99. You can get it for more than $200 less on eBay right now, provided you don't mind a refurbished unit.
The Tab Pro 12.2 is rocking a 2560x1600 LCD, an Exynos 5 Octa processor, 3GB of RAM, and a 9500mAh battery.