What is the difference between these car stereos?

[Brian]

Ok so im shopping around for car stereos and im not looking to spend alot and im looking at the JVC KD-R'S, And there is like three different types and im wondering what is the major difference.

Theres this one--KDR-200
http://www.walmart.com/catalog/product.do?product_id=11062592&findingMethod=rr

This One--KDR-300
http://www.walmart.com/catalog/product.do?product_id=11062588&findingMethod=rr

And this one--KDR-600
http://www.walmart.com/catalog/product.do?product_id=11062598

Im looking at getting the 600 but the only main difference I see is that it has a usb plug for the ipod which is very useful.

The only reason I like the first one is that it comes with the bottom buttoms with the numbers 1-5 but would I really need that?

But Im looking really at the 300 but I wont need the usb plug but is that really the only difference?

And Please no one tell me that these are all cheap... I know they are.
Like I said I dont want anything fancy im just looking for something for now.

Someone help. Thanks in advance.

 

[cjresha]

ok so other then the usb port theres not really any diff between the 300 and the 600. thats the only diff between them the 300 and 600 r nice because you have more presets for the eq i believe the 600 gives you more customize ability for ur eq then the 300. the 200 just sucks bt if u really dont care wat ur speakers sound like go for the 200 if u want to control what ur speakers sound like go 300 if u want more control on ur speakers and a usb port go 600 but u dont need the usb port unless u puttin a flash drive with music in it if ur usin an ipod the 300 and the 600 come with AUX inputs to plug ur ipod into it