Crutchfield vs. Best Buy vs. Local Dealer

I was just wondering how to go about buying my new system. I recently looked around at Best Buy and wrote down all the speaker size prices with components going for about $70 and 6 x 9's and 90 to a Rockford 12" sub going for $80. Now when you come home and do further research and take a look at Crutch, I find that the lowest components and 6 x 9's for Kenwood are up into $150 - $200. Now Crutchfield is somewhat respectable and I know that some companies sell products to Best Buy and only for them with specific model numbers only used at Best Buy. I'm looking for pretty much a Kenwood setup all the way through, but is best buy selling old shit or whats the deal. Am I better off going through local dealer. I mean i guess i can get the speakers at best buy, but what really am i getting older models or just less performance?