True, if you buy the package it gets darn close to the OP's $500 price-point. I did a little legwork and sourced the parts myself and am probably in it for around $300.
Just throwin' out another option, is all. Didn't think the OP was being strict about the 'mopar only' thing since he was already looking at aftermarket stuff. But if he is, the 73'-up stock setup is probably the way to go.
(for what it's worth, the calipers I bought for my scarebird setup were kelsey-hayes and the rotors were made by centric, I believe)
