jayheels:
Assuming Gerry meant 12 ft down...
Depending on the lay of the green, I'm with jayheels. Using the L71 Nike ball and L100 Vapors, I like shots where I can hit the full value of the club with little or no spin. If the green slopes downhill toward the pin I might use a bit of backspin, if it slopes uphill to the pin then neutral or a touch of topspin.
So for me, full 7-iron, maybe a bit of spin depending on the above variables.
If Gerry really meant 12 yds down, I'd drop down to 8-iron.