I think in the next 15 or so years a LOT!!!! of people are going to REALLY regret the wrist tattoo fad.
I think the cross is a fantastic idea, but I'd definitely put it in a more forgiving spot.
I'm considering getting a silhouette of north and south america done in a two inch segment on the side of my ribs - also supposed to be a super painful spot, but more covered. But that's just me