(2007 HB) Pontiac vs Polk 6.5 Speakers?

[lman146]

I'm looking to do a sound system upgrade on my 2007 3 door in the next week or so and need some advice. I am planning to upgrade to a new head unit and replace the two front speakers. Eventually I will replace the rear speakers and add a subwoofer (10 or 12 probably) to the trunk area.

I chatted w/ a rep from Crutchfield who recommended I get Polk DB615's for the front speakers. The guy who will be installing them for me is recommending that I go with Pioneer speakers instead. Does anyone here happen to have experience with both and would be able to describe the differences or pros/cons to each?

Also, any other tips for the sound upgrade are welcome. I listen to a wide range of styles anything from jazz, gospel, hip hop, rock, acoustic guitar solo, you name it (I am a musician myself).