Woah, a reply! I forgot about this thread, if not for email I wouldnt have known I got a reply at all! :p
I have been doing as much research as I can since picking my Focus up and it seems everybody is going with the LCQ-1 loc and taps into the rear speaker wires as you said. I think I am probably going to go this route myself once I have the extra funds for it. The amp is my next issue, I want something that will fit in the same location as the stock amp that comes with the 10 speaker Sony system so I dont have to worry about taking up hatch space.