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I've been out of the car audio business for many years but I know all of my BMWs for the past 14 years have seperate amps. Does the camry have an amp or is it all integrated into the head unit. The reason I ask is that the humming you are experiencing us common on aftermarket systems that run amplifiers with Mosfet chips. Many Mosfet amps (Rockford Fosgate is particularly bad) have RFI noise. My last two systems did this on AM only and it was unbearable with the Fosgates. I switched to Phoenix Gold (still Mosfet) and it's alot better now, at least I can listen to AM without getting a headache. The reason I ask if the car has an external amp is that if you get a new HU you will need to get rid of the amp if you want to solve the problem...this might require some extra wiring or knowledge of the ins and out on the amp so you can wire it out of the system. It will also help to know if the amp has crossovers built in (again, BMWs are like this)...so if you get rid of the amp in BMW and stick with the OEM speakers then you also need crossovers.
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