Here is what I recommend and it won't cost a lot. Buy an alpine cde-103bt from crutchfield, use the existing amp to power the dash and door speakers off the pre amp connection on the back of the deck. I recommend you replace the dash speakers with the alpine ones also. You can leave the door speakers alone for now. They are just woofers for bass only.
Later on you can install speakers in your rear storage compartment and use the alpine decks built-in amplifier to power those. I'm running 4 Polk audio 3.5" in mine, they sound great.
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