Chasing 20 hz or sub 20hz is more a movie thing for me by far, but I do listen to some "subwoofer candy" music like shadyj's thread calls it.
FWIW ML and Focal may be well known speaker companies, but for subs not so much. I'd look at products from a sub specialist like SVS, Hsu, Power Sound Audio, Rythmik, etc. The Dynamo 1000 if you get a significant discount could be alright, though I'd sure like to see some third party measurements first.