I've always used Pioneer head units with infinity kappa for mids and highs. They sound great, but you can't really go wrong with the bigger names out there. I've always wanted to try a kenwood because I hear good things about them also. Maybe my next build will be a kenwood. If you want good bass you'll need a sub or at least some component speakers. Check out crutchfield.com, lots of good info and resources there, not the best prices, but that's where I do my research.
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