I dont understand this issue of water in the doors with aftermarket speakers. If your installer did it properly this should not be an issue! I have the Hertz Mille 3-way kit with 6 1/2s in my doors and my car has seen plenty of rain and no issues. The factory speaker enclosures have nothing to do with sealing the door!
As to the rear speaker question and using the stock components, if you are going to spend money on audio rip it out and get some decent components in there and forget about rear speakers! Go to any high end audio shop or, better yet, any car audio competition. You will NEVER see rear speakers in those cars. And, if anyone wants to complain about not being "surrounded by music" come for a drive in my Box and you will see why you do not need rear speakers.
Patrick
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