I have a 2000 Contour Sport, and have been looking around at speakers, and I was thinking of getting either the Pioneer TS-A6867, or the Rockford Fosgate HPC2268 (both I saw on sounddomain.com). They both seem pretty good, and pretty well priced. Does anyone have any other recommendations on speakers before I purchase these? I don't know what exactly I should be looking for when I buy speakers.
I currently am just using the amp in my deck (45Wx4), but am planning on getting a "real" amp later (once I get some more money). How do I tell if I have the factory amp so that I can bypass it (I have seen that mentioned a few times here

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Also, how do I remove the door side panels, so I can get to the speakers to install them, and what kind of tools will I need to put the door back on. I installed speakers in my last car (a Pathfinder), and the door panel just popped off and popped back on, so I am hoping it is similar.