I have only had experience with the 40. It was a cool unit had some great features like the bluetooth, dvd, 7 band eq, and that touch whatever its called. the feature where it senses like hand movements and turns the display on if it dims but, the unit didnt have the greatest of sound quality just like all other jvc's i have dealt with and it only had 2 volt pre outs.
Its your money, if you like it you cant change your mind but I think you would be better off trying a double din or good flip out if you want a screen to.