I never thought I was going to end up with a JVC. I researched all the brands quite a bit before I made my choice. In my opinion, just because brands like Pioneer and Kenwood seem to be the most popular, does not necessarily mean they're the best. Some of them are over rated, over priced, and anything but user friendly. They both make good stuff, and I'm by no means saying anybody is wrong for suggesting them, but there are other options. I'd strongly suggest at least taking a look at the JVC unit I have or the one MountainMike has. Even if you don't like either one of them, you should know that even though it says JVC on the front instead of Kenwood or Pioneer, they are high quality with no compromises. They pack a lot of features, they're priced right, and very user friendly. I've never needed the manual for mine. Everything is simple and straightforward.
EDIT: Add Flash517 to the list of JVC advocates.