For a simple audio build they are expensive and over the top. For a more extreme build I could see it being done. These guys may have an idea of what you are looking for.
Hey Tj, I am late to the party, but I agree with you, accept bumper jacks across the hood are SEXY. I am also looking into the Wakeboard speakers, Memphis 6" or Rockford 8", did you end up installing any? I was more worried about the size, personally. I am going with a great head unit, great amp, and 2 speaker system. I see no audio benefits to having more speakers in the tj, and I dislike what Subs do to Music, great for movies, but I have produced music for too long to enjoy subs, and why do I need 60 to 200 hz in my tj when I have headers and a free flow exhaust with 37"s?