I will echo what many have said. I have M22s paired with an Outlaw LFM-1 EX sub, which many compare to the HSU subs (apparently they were designed by the same person, Dr. Hsu). I've been incredibly happy with it. Until then i was not as in love with my speakers, they just didn't have the "oomph" i imagined. They are incredibly accurate, just too small to make any impact. The difference a great sub makes is night and day though. I would agree to go with the 350 or possibly investigate the other brands, when I got my Outlaw they were having a free shipping promotion, so I got my sub for $600 even, which is a harder deal to beat out the ep350 when you have to pay $70 shipping on top of that.
also +1 for factory outlet, i can't find a THING on any of the pieces i ordered