Frankly my choice varies on what the user expects from such. If the user is just that and wants less to fiddle with, that is, doesn't want to deal with odd issues, you get the iPad or KF. The Google tablet set the bar high up so the technocrat would go with that and the person that feels OK with fiddling and the other limitations would go with Sam.
I know that's not an exact answer but it all depends on you.
Need a new toy, on the cheap, howsabout a tablet?
Will be my first. Want to buy something I can kick around without being married to it, hence going low cost.
So it comes down to the four contenders: Kindle Fire HD, Nexsus 7 8GB, Samsung Galaxy Tab 2 7in, and perhaps even the BB Playbook.