In my 99 SE, I went with an Alpine CDE-172BT head unit with their "power pack" KTP-445A module that increases the output to 45 x4 watts. I also installed Select Increments pods
(Dash Pods) in the dash with 5.25" Alpine coaxial. I put 6.5" Alpine Coaxial in my Vertically Driven rear sound bar (with modifications) and removed the mid range and tweeter drivers and sealed the whole thing. I picked up a 10" self-powered sub from Walmart
(Dual Sub) and mounted it on the tailgate door. This setup is absolutely amazing. Although, I am not super happy with the rear soundbar even with the stuffing in there and all. The soundbar is still a large single chamber with two speakers that are not isolated from each other. The 5.25' speakers up front in the independent sealed pods actually sound more accurate. I just picked up the stock individual rear pods from a Jeep junkyard and will go with 5.25" coaxial in them. If you have a sufficient sub, I really believe you do not need the 6.5" upgrade in the rear soundbar/pods. The extra size will not give you the bass you want in such a noisy vehicle. If you set your high pass filter to cut off anything below 100-120hz to all the 5.25" speakers, then the sub will easily fill in the bottom of your sound. Just for the record, I'm an old classic rock, jazz, jam band kind of guy. Clarity and accuracy are what I'm after. Of course, this all goes out the window when you hit 55 mph with a soft top and MT tires!