It really depends on the size of your living room when deciding on which series.  I have a room that is about 18x18.  I have the 4 series hybrid and it's plenty loud.  The 8d rattles the walls if you want it to.  When deciding on speakers, I narrowed it down to the B&W's Sat's and the Aperions.  4T's win hands down.  I just got the 4B's this week to complete my system.  Fabulous system.   I believe I'd have to spend atleast twice what I paid to get the same quality.   If you listen to a lot of 2 channel stereo, you might consider the 5 or 6 series for the lower bass response.