Sub recommendation for new M 70's ?

justme12
justme12 Posts: 4
edited December 2009 in Speakers
Well, I did it. Ordered the newegg M70's and a CS2. At that price had to do it!!
Have M40's as surrounds and an old Polk 10 thats horrible. With the M70 giving decent bass in itself any thoughts on a complimentary sub?

16 x 22 x 7.5 room, mostly music listening and no need for volcanic booming.