the best quality/thump for the price i have found is 1 or 2 Alpine Type R 10"s with an amp big enough to push them (500 watts RMS each)
and there are basically 3 good boxes that are perfect for the 8
the 4080 box (do a search on this forum)
the zenclosures box (do a search for "RX8 box" on ebay
and a Qlogic single or dual 10" box check my thread
here - there is also a single 10 version of the same box