Although LG have come up with newer models, my trusty old LG G Pad 8.3 is still my "go to" tablet for when on the move. 1900x1200 resolution (none of this 4:3 nonsense seen in recent tablets) and an SD card slot are nice bonuses, though watch out for colour calibration issues and a somewhat darker display than other tablets.
I *strongly* recommend that you put CyanogenMod on the G Pad 8.3 - it's an officially supported device and CM lets you tweak the colour calibration too in the Settings. I just wish LG would come up with a decent successor to it - all their later models just don't do it for me.
When it comes to Android, there's only three solutions to getting decent updates: a Nexus device, a device that ships with Cyanogen OS or a (preferably official) CyanogenMod custom ROM install.