i used the monster FM transmitter, but eventually it stopped working properly, would only play out of the left speaker. i have the itrip now. i got the one with the digital display. got it on ebay for $19 with shipping. they both had some static but decent sound and so far im happy with the itrip. it works better with my setup now cause i have a vehicle mounted holder, i got from www.proclipusa.com
and has a charger, so teh itrip fits nicely on top.