The sub will go with any head unit, but THX is right that you might want to save a little extra cash to go for a better head unit, like the kind he recommended.
When I bought mine, I went for something simple because I don\'t need a tv screen on it or a crappy video of a dolphin swimming, so put the money you save by skimping on those things and toward an Alpine.
The other thing that you\'ll likely want with a head unit and sub woofer is an amp. The morep owerful the amp, the bigger the battery drain, the louder the music, and the easier it is to blow the sub woofer when you get carried away, heh.
That\'s about the most specific I can be, when I got my system I had a couple "experts" help me and my main concern was the price cap.
-Dan