I use the sub only for the Logitech z5500 with 2 JBL Eon G2 10's. That sub will rattle the windows. 188 watts RMS. There is a volume boost if needed, but I only use a little of that, with plenty to spare.

It weighs only 34 lbs and I easily haul it using a rolling duffle bag. You can get them on approval if you need to order one.
http://www.amazon.com/exec/obidos/ASIN/B0002WPSBC/km-20/ref=nosim

I really think if you try this one out, your search will end

Best
Scott
http://ScottLMusic.com