What is the best device to use to listen to an ipod in a car?

Question

which one has the best sound quality and such..

[for cars without an AUX output]

Answer 1

I'd suggest you buy a head unit with an Ipod dock.

Answer 2

any direct connention between your ipod and car is best. so needless to say AUX or USB output would be the best, or if you have a cassette player then you can get a cassette mp3 cd adapter

http://www.amazon.com/gp/product/B00006J...

if you cant do any of the above your only choice is a fm transmitter. which sends a radio signal from the ipod and you can tune into it on the radio in your car

http://www.amazon.com/gp/product/B000BWA...

oh yea and of course you can buy a new head unit which has a AUX output...oh course this would be the most pricey way but also the BEST way