iPod integration

[Metric.]

I'm looking for a decent FM transmitter for my iPod video . I have an iSkin on it to keep it from getting scratched, so I need one that plugs into the bottom with a cord instead of a cradle. I had a cradle type one in my other car and all it did was scratch my iPod and if I hit a big enough bump it would come loose.

Which one would you suggest?

http://www.bestbuy.com/site/olspage.jsp?skuId=8137786&st=ipod&lp=7&type=product&cp=1&id=1158323025760

http://www.bestbuy.com/site/olspage.jsp?skuId=7705227&st=ipod&lp=14&type=product&cp=1&id=1138085296065

http://www.bestbuy.com/site/olspage.jsp?skuId=7750249&st=ipod&lp=14&type=product&cp=1&id=1140394452806

http://www.bestbuy.com/site/olspage.jsp?skuId=7048312&st=ipod&lp=1&type=product&cp=1&id=1107956964452