Hi - just picked up a 4G 20GB iPod to replace my 2G 10GB model. I can't believe how much smaller and lighter the new one is. Wow. Does anyone have a recommendation on a *good* FM transmitter for the iPod? In one of my cars, I only have a CD player/FM/AM head unit with no other input options (e.g. cassette adapter, Aux input, CD changer controls) but before I buy one, I wanted to know what's the best FM transmitter on the market? Unfortunately, swapping out the head unit with a new one such as the new Alpines with integrated iPod support isn't an option. Thanks!