stay as far away from sony as possible!!!!
that is a nice alpine unit, you might want to check ebay for that unit, usually much cheaper than from crutchfield and other sites.
i have a tj with a factory soundbar and installed a set of infinity kappa perfect components and mounted the crossover inside the sound bar with some double sided foam tape. the kappa components go for a good price on ebay.
here is a shot of my sound bar had to do some trimming of the cover to get the tweeters in, and had to drill 2 small holes for each, two for the mounting screw and two for the speaker wire hole that is all hidden.