Car audio system.?

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Car audio system.? I wanna purchase a pioneer DHP 5870 MP3 palyer with OLE dispaly...etc with JBL GTO 0937, 6*9 3-way speakers for the rear. for my new Alto...does it work good???? suggest me the best of speakers/Audio system/tweeter for the front. and also the size and shape of the rear speaker box...etc. as this is my first entry towards my car audio systems... I've gone through all the pages of speaker boxes...I could'nt get the exact size N shape of the box which fits my car...and also wanna know what is polyfill???