Are you going to have a 2 channel set up with these B&W speakers. If yes then you should start thinking in terms of an integrated amp at first. This may hook you into this insane hobby and before you know it you will have monoblocks, some tube gear, a turntable, and so on.
Seriously if you are thinking that this set up is for music then forget the AVR and buy a decent amp.
Seriously if you are thinking that this set up is for music then forget the AVR and buy a decent amp.