I use the Belkin Blue Tooth Solution - I had it hard wired into the car so that I could hide all the cables. So basically its been wired into the car battery via a wire taken form the cig lighter. Its an FM transmitter but it works like a charm - perfect sound and its running through an Alpine amp and Pioneer speakers.
On the rare occasion I do get static, it has an auto tune function, just press one button and it will find a clear frequency. Easy.
It's also a very good BT Phone car kit, the microphone picks up your voice very well and the callers voice is placed through the car speakers - seamless.
Here's a link to the product page
One of its advantages, and the reason i had it hardwired into the car is that it charges your phone too.. a must if you use GPS software on the phone which flattens the phone battery in seconds.
Here's a pic of the controller...
and because its wired into the car, the phone sits nicely and neatly -
I'm about to buy a GTA and I think next time I will get a dedicated BT system to plug into the back of the OEM headunit.. more expensive... the Belkin was a good inexpensive compromise.