This is the Kicker Hideaway behind my seat. I am 5'7 and have no issues with it there which is why its behind mine, if I were taller I could simply have put it behind the passenger seat. That Pioneer option also looks nice and will save a 1/2 and inch but I really like the quality of the kicker and will vouch for it on sound quality and ease of installation.
*note* disregard condition of my seats. my purchase of a zeintop pushed that project right on down the road. Its also snowing so that's why all the white lines in the pic.
I will post the link to the subwoofer as well.
KICKER | Hideaway Powered Subwoofer