Using Android In Car: Solutions?

I've an HTC and would like to start using it in my ageing Seat Leon. I have no 'line-in' to simply jack into the stereo so need one of these devices that utilise an FM channel I guess. Anyone got one of these? Any good?
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http://www.amazon.co.uk/GZ-Wireless-Tra ... 2_edpp_url
if you pay more you can get one with a frequency display, which makes it easier for tuning the car radio, 5.95...
http://www.amazon.co.uk/JSG-Radio-Trans ... ce_title_0
otherwise they are all much alike, finding a clear channel and proximity to the fm antenna are the keys to success, if you are going through areas with fm transmitters then you may need to retune
It was fine to keep the kids entertained for a while and OK for speech but hardly hi fi.
Any cheapo FM transmitter with a 3mm jack should be OK and they were available for between £5 and £10.
I mucked around with these then gave up on them. Not worth it IMHO.