You are a guy - You are getting a girl car. I have a Sunfire. I love it... But it is a girl car. Don't put a body kit on a sunfire, that will look ridiculous. As for a stereo - Go to Best Buy or Tweeter.
id go with the g6 on this one everyone is pretty much right on the way the sunfire is made they have too much plastic in them but they do look good ,but turned out to be problem cars for their owners,id have to go with the g6,good luck.
All car companies work to make their own cars resemble each other on purpose, it's a form of brand identity. You'll always see styling queues shared among models. But the Trans Am was first. It was redesigned in '93, where as the Sunfire wasn't sold ...