iTrip
I have an Ipod mini too and i use the Griffen iTrip and its worked really well for me, but my friend's did not work at all. so, she went to return it and they wouldn't give her her money back because they said only about 50% of them work satisfactory and she should have got the Belkin, so i guess i was just lucky to get a good one. although, it does have its bad moments, especially when i first purchased it. as for the Belkin one, i have never used it, but it is more money and has a better satisfactory rate. a lot of the transmitters are touchy, and i guess the only way to get a sure fire one is to haul out the big bucks.
there is also the cassette adaptor if you have a cassette player in your G6, unlike us, but i don't know how it works or how much it costs, i would assume it would function fine because there is no transmitter, just mp3 to cassette and i don't think it costs all that much.