Invisible Shield (Back Only) + Leather Smart Cover
Ive used front and back invisible shields on all my large screen handheld devices for years but finally broke the habit with the 4S when I realized that the glass is extremely scratch resistant and the screen both looks and feels better bare.
I am going to use a back shield though because the aluminum does scuff and I plan on selling next year so having it scratch-free will maximize its resale value.
This is what I have used for my past 4 iPads. Sleek with a great grip. I went from blue leather on white to tan on white. Keepin it classy.