Automotive Forums

Hi from Vegas everyone;
I recently bought a Solara that had 20.000 miles.Price was so good,I had to.But it has the standard boring stereo.I want to get better sound,but no so much to entertain the neighborhood.Just simply quality sound.I listen to rock/jazz/dance everything.(I'm a drummer)If I simply just add a subwoof and amp,than it's only got a single disc inside,so swapping cd's are a burden.A very ignorant question,but,if I buy a head unit that plays mp3's,would a professional be able to install it?Will he remove the existing one?On top of a subwoof, should I get the speakers in the car replaced too?And all this needs to be in budget.If I go to Fry's (a local large store like best buy)will I pay too much?Is it cheaper to buy them all online and get a pro install it?
If anyone read all this to the end..thank you so much...