Using the aux out for your phone works just fine. I tried it on mine and people say they can hear me fine. A USB port just gives you access to your MP3 really, so I'm sure you can live without it, unless you want to control your player through your stereo or steering wheel.
As for brands, I couldn't help you with that. I bought my car and it came with a Rockford Fosgate factory stereo with sub woofer in the trunk and 6 cd in dash player, so I just stuck with that.

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