I would recommend Nvidia shield K1.
http://www.gsmarena.com/nvidia_shield_k1-7832.php
Or if you can get your hands on a xiomi mi pad 2
http://www.gsmarena.com/xiaomi_mi_pad_2-7770.php
I am in the same boat as you looking for a good Android tablet. These 2 so far have the best price to spec I have found. I am leaning towards Nvidia as I already own its nvidia shield tv. Though Xiaomi screen is making the decision difficult but Nvidia is very good with the os and software updates and fixes.