I don't think the ledger art versions would work well, which is unfortunate. Of those, I think 11 and 13 are the most interesting. I think 8 is the pretty clear winner. It's a big, bold, off-center image, that goes right to the edge, which makes it the most striking. I also like 7, which has a flowing style that portrays motion well, and captures the subjects from an interesting perspective. It doesn't seem to be doing well in the poll, however.
I don't hate any of the designs, so I don't think I'll be unhappy with the 2012 dollars unless design-by-committee manages to screw it up before then. I am a big fan of the 2011 design, which was pretty non-traditional and daring.