Amp and Subs is pretty much self preference. I'm partial to JL Audio. But for $500 1- Phoenix ZXTi600 and 2-Alpine TypeR 12's would be sexy.

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MECA SQ JL AUDIO 500/1, 300/4, 3-10w1v2, XR650-CSI, Kenwood DDX-6019 , Alpine amp and JL TR400CX center channel , 300 lbs of Dynamat.