I have a Belkin....you can choose any FM frequency (and store 4 of them for future use). I like the fact it is auto off......so you don't run down the battery if you forget to shut it off. I think all FM transmitters are limited on their output by the FCC. C.Crane also has one, but it is more expensive.
I want to use my H320 to broadcast to my car and a home stereo (not at the same time, of course). What's the best FM transmitter for this? IRiver has one, but it looks like it will only be powered if plugged into a car.

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