Of those mentioned I think I would go with the NEF Sidekick. For no other reason then the company that makes them has been making that action for a long time. Also I have had a chance to handle the Sidekick and it is a nice shouldering rifle. All reports are they are great shooters out of the box.
I've heard a few complaints about the Sidekick, but still, I'd buy it. I've heard the ramrod (extendable) is flimsy, and you have to make sure the barrel-to-receiver fit is snug. Also have to choose medium or high scope rings to avoid having the hammer hit the scope.