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I have a question, however, in that early in your post you state that volume is controlled within the amplifier itself, but later you list the preamp signal wire colors. If the volume is controlled remotely within the amp (a la GM and BMW, among others), then wouldn't that mean that the preamp signal can't be run directly into an aftermarket amplifier without some sort of preamp volume control? (JL Clean Sweep, Zapco SX, etc?)
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Note: I've removed my original comments about tapping the preamp signal for the time being here while we validate if the information is true for both the 2005 and 2006 models.
In the meantime, I have tapped the rear speakers and I'm using the AudioControl LC6 as my LOC. Please PM with specific questions.
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After the factory amp...(call this the "best" feature retention option)
After tapping the rear speakers for my signal, the overall sound quality is very good but feels (subjective points here) a bit "bright". My unscientific ear says that the signal to the rear speakers is not completely full range and does have a good amount of bass eq'd out of it. The OEM crossover frequency chart from El Duderino should prove this out (please post). You should expect to give a good crank on your subwoofer amp gain to compensate for the lack of bass in the rear speaker signal if you go with this option. Finally, you still lose the ability to fade as the rear speakers give you just a two channel input. However, tapping the signal after the factory amp at the rear speakers allowed me to use the factory amp to continue to power the dash speakers and therefore UConnect. The factory amp also controls the mute function and automatically mutes the system when a call comes in or is made through UConnect. My original objective was to keep factory steering wheel controls and UConnect but add aftermarket amps and speakers. This was the only option I found as a Do It Yourself installer to keep all things working. I will play around with tapping the factory subwoofer signal as MauiHemi suggests to see if I get a better signal for my bass amp.