I am going to buy a new Radio/CD Deck for my car. I want to get one with more features. I am looking at JVC/Kenwood/Blaupunkt. THe reason for these 3 brands is because I want one with a USB port and these are the only I have found. My question is should I use the AMP that comes with the new Radio or should I use the one that came with the car? And will I have to rewire the speaker to the new Radio if I want to use the new AMP? Or should I spend $200 and get a new AMP? I am thinking that I will replace the rear 6" subs with something but what? More Subs or a good 6.5". Any thoughts?

Also if anybody has any of these radios, I would like your advice. I want one that will match the cars dash. I have a Black Limited Roadster with the Grey Leather. I am leaning towards the new Blaupunkt MP56 St. Louis. It is just that it is not for sale yet but looks the coolest.