well... i think if you would like to have controls for your songs/playlists with your navi system. (i am assuming you have navi) then go with the OEM (I bought mine on ebay for 20 bucks) went to the dealer a week later to exchange for a brandnew OEM adapter for free of charge.
If you don't care about the controls then go with something cheap. you can buy anything for like 5 bucks.
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