[mikegett]

Like stated, the W7 won't work well in the rear panel. They are more of a small sealed enclosure not a infinite baffle. You would have to remake the entire rear seat and deck to seal it off entirely. There are a number of reasons why people don't go this route. One, the vibrations from a high spl sub would be unbarrable. Second, spl subs use cabin pressure to produce most of the bass. You would be better off getting a pair of the W3's if you go with rear deck install.
You won't be able to fit any high end 6.5 comps in the front of your alero without major modifications. I had the 6.5 xr comps and eclipse 6.5's in my alero. I had to remove the map portion and fabricate a new enclosure to allow the speaker to sit on the outside of the door. Go with a nice set of 5 1/4's. I loved the JL's I had. Directed makes a very nice set. I would kill for the chance to hear a set of Focals. Sorry, I just remembered. Check into the Boston Accoustics flag ship. I nearly bought them over the JL's. They were the same price, the JL just seemed to have a slightly nicer tweeter. However, the Bostons use a NiMh battery. so the depth is much shallower than the JL. It may fit.