I can live without a sub. I don't watch action movies often enough to benefit from a subwoofer.

I have to say, however, most people really like to hear/feel every last note and boom in the soundtrack. I really don't think a decent small subwoofer would be overkill in your case. You may be surprised at all the stuff your mains are not reproducing.

No slight to B&W intended, I might add. Fine speakers.