With what you said about different devices, I was set on the nvidia too, but spent way too much on a new curved 65", $250 remote, wall brackets Ps4, ect. So when I realized the 6+ was too small, it's too big for a phone, but who uses them for phones anymore, I new I had to find a tablet.
The ZenPad has arguably the best displays made, of course it has GPS although not needed with activ trac, it's nice to have for the maps though.
The thing is I was able to get a refurbished one at Amazon, to be honest, if I could have found a refurbished nvidia I might have gone that way, but for $100 or so (I can't remember actual price now) I got what looks and feels like a brand new 8" with a great display.
If $$$ is no object I would get another IPad, if I had the extra but not iPad money, the shield, and if your close $5000 for the month and your wife beating the crap outta you, lol then look into a refurbished Asus
Plus, it's a lot nicer of a tablet then I had figured, it's slimmer and lighter then the shield, has a nice backing on it, and it's Asus so it's solid and has Intel CPU