Just get the Minix Neo U1 with the Neo A2 airmouse.. or the newer A3 remote if you can get your hands on it. It's a device that's been out for awhile, battle tested and cheaper than ever. Has 2GB RAM, 16GB ROM, Android 5.1, can be rooted/unrooted at will and has a solid firmware with OTA updates. Lots of real world reviews on it, including mine..  It's my current device and I can answer any specific concerns you have about it.

Bought mine from lazada. U1 together with A2 light mouse for RM519 :-
http://www.lazada.com.my/minix-neo-u1-quad...e-14300738.html

It was the best deal i've found around at that time (and the seller is in Malaysia, so quick delivery compared to overseas sellers) but pls do your own research. Maybe got better deals around now.