Which car charger do I need?

This + OEM cable.

http://www.newegg.com/Product/Product.aspx?Item=N82E16875994944

Have a look at TomTom website for this one (it's in UK, but I'd guess they do one in USA).
http://www.tomtom.com/en_gb/product...-cables/high-speed-multi-charger-9UUC.001.04/

jstar002 said:

don't you need a usb port to use that one? My car is so old it doesnt come with a usb port... where do i get OEM cable?

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That adapter plugs into the cigarette lighter and you get an OEM cable from the Apple Store.

Monoprice also has inexpensive chargers.

jstar002 said:

I know its different level of amps, but does the second Belkin one fit into a cigarette lighter socket? The plug looks different?

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From the very link you posted:

Plugs into any car power outlet

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jstar002 said:

don't you need a usb port to use that one? My car is so old it doesnt come with a usb port... where do i get OEM cable?

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No, the charger has a USB port (for charging only). The charger plugs into your car's power outlet. You need a USB to Lightning cable to use it.

If your worried you might bring in the USB->Lightning cable and end up not having it in the car, get one of the two you linked (as they work only in cigarette lighter style power outlets).

If you have extra USB->Lightning cables already or want a little more flexibility grab the little one that gives you a USB port in the car (this is what I did, so if my phone is dying I can snag the USB->Lightning cable and charge the phone in at work after arrival without leaving my phone in the car on the always-on outlet)

Keep in mind that the cheap car chargers do not charge the iPhone when you are running maps and keeping the screen on.

Make sure your charger atleast delivers 1 amp.