Personally I was not too impressed with the Meridian subs - they seemed to laid back for my tastes. In the end I went for a REL Stentor III which seems to work reasonably in my system (G91, 861, D7K, 5500HC, D5K). If I were looking now I suspect I'd also consider the Velodyne range (particularly the DD series). Subs, like all speakers, are really personal - you *must* listen to them preferably in your home environment since subs really are affected by the room in which you place them.
Just my 2c worth...
Graham