I recently installed a Profile amp with a single Type R in a buddy's VW...that worked out really nice.
Much, much lower than $400...try under $150 //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif If you aren't on that much of a budget, something by Arc Audio, JBL, JL, Alpine, or several other manufacturers will work also.