Best FM transmitter for an mp3 player?

[blurredvision]

I just bought my wife a Zune 4GB flash player, and she wants to use it in her car due to her lack of a cd player. It doesn't matter to me if it's one specifically made to plug into the Zune, or if it's just a "one-size-fits-all" transmitter that simply plugs into the mic port and would work with any mp3 player.

I obviously want something cheap, but I don't want crap either. Any recommendations? Sound quality is important here, but ultimately, it still is a simple transmitter, quality isn't going to be that great anyway. If someone has one to sell, I'd even consider it.

Thanks.

 

[ZOXXO]

I bought this to use along with an Archos Jukebox but found the sound quality to be poor. Power and traffic signal lines would interfere with it and there was a constant hum/buzz when I used it in my old truck.

Though a quality head unit may have mitigated much of the static, if I were in the market for another such gadget I would likely look toward the type that plug into the antenna line rather than wireless.