I need to know what the diffrence is between the Jensen VM9312, VM9412, and VM9512.

 

You can get the specs from Jensen's web site.

 

Why not go with this Pioneer H.U.? http://www.crutchfield.com/S-PdDHbYR...h&i=130DEHP77D

 

Unfortunately, that's an older unit that is overpriced (not a knock at Crutchfield, thats the price it typically goes for). Pioneer makes better newer units with more features for less money (for example, you can get a newer Pioneer headunit with MP3, AUX in, USB, and possibly Bluetooth for around the same price -- example: DEH-P6900UB is $240). The only downside is that they are 1 DIN instead of 1.5 DIN which means that you'll need a mounting adapter/kit.

 

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the new panasonic's are very nice and same with the kenwood excelon series. i would stay away from jensen, clarion, dual.haha. anything like that is bad news. i personally wouldnt even go with anything by sony or pioneer. my fav.'s are panasonic, kenwood and alpine if you can get a used one for cheap, they are ballin