Originally Posted by bigaudiofanat

Yes keep the alpine nothing wrong with that unit unless you want gps. I would change your speakers to components otherwise your not going to get the best sound quality. A few people have regretted going coaxial and replaced with components sets later on. The polks for rear fill would be fine unless your wanting to go with something higher end like focal which you really do not need to for rear fill. I personally wouldn't do any rears.