They all look good. I have no clue which to pick.
I gotta say though I don't think it's a good idea to carry around your private key. 2 seperate ones would be nice, One for the safe and one for the wallet for deposits. Of course a pair of scissors would take care of that!

WTH are scissors called a pair of for anyway?
Haha, maybe because its 2 pieces connected together? Honestly I have no idea!
They do all look great, its gonna be hard to choose.
Edit: What's the difference between 6 and 7?