Im new to this audio chat, but im looking into upgrading my sound system in my car(Benz-1999 c 280sport). and the sells person at one store said to install rockfords 5' 1/4 in the fronts and 6'1/2 in the rear, and add a Kenwood 640watt amp to it,and use a pioneer cd player,, but then at another store i was told to use a alpine player with the R-series speakers,and the alpine amp. I want the best i can install in my car, so if anyone knows of either of these products, or anything else i could put in. iwould apperciate the advice!!!!!