What is the best GPS kit for iphone Touch 4G?

What is the best GPS kit for iphone Touch 4G?I just bought iphone Touch (4G). Now, I am thinking of using this for GPS in my car. If you have used any of car GPS kits (Magellan, TomTom, etc) for iphone Touch 4G, could you share your experience?
As far as reading the reviews on the web, some of the car kits do not seem to be compatible with 4G.
Most of the car kits listed in the shopping sites still do not include iphone touch 4G in the compatibility list. So, I would like an answer from someone, who already has tried any of the car kit for iphone touch 4G.

Jordan
check out at Amazon you can find more options here.
http://www.amazon.co.uk/s/qid=1286967146/ref=sr_gnr_fkmr1?ie=UTF8&node=&search-alias=aps&field-keywords=GPS%20kit%20Touch&tag=klnprk-21

Also check out at Ebay
http://rover.ebay.com/rover/1/711-53200-19255-0/1?ff3=4&pub=5574865779&toolid=10001&campid=5336440665&customid=klnprk&mpre=http%3a%2f%2fshop.ebay.com%2fi.html%3f_nkw%3dipod%2btouch%26_sacat%3d0%26_odkw%3dipod%2btouch%26_osacat%3d0%26_trksid%3dp3286.c0.m270.l1313

Give your answer to this question below! GPS Tutorial – Questions & Answers. GPS solutions for your Car, Motorcycle, PDA and mobile phone - The smart choice in personal navigation.

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