Thanks for all the info in this thread. Going to change my headunit in the next couple of weeks then the rest of the system shortly after, this has answered a lot of my questions.
I have one question remaining thou, somebody already asked but i couldn't see that it had been answered. Will you need two lines boosters if you plan on keeping the original sub and speakers? So far i have only heard needing one mentioned but if the sub and speakers run off different amps don't you need two?