I'm looking to upgrade my system in a 2000 Eddie Bauer and want to get a 5-channel amp for new Polk DX7 3-way speakers (front and rear) and an MTX Thunderform sub. The only location I can think of to place this would be under the rear passenger side seat but the dimensions seem limited to about 9 inches deep and the contour of the floor is quite irregular. First, any favorite 5-channel amps? Second, will this location suffice for most amps or is there another location to consider without giving up space or being noticeable? Thanks for the help.