I am pondering whether to go for the M72 av speaker package or the M73 package for my Denon 2802 amp. Both packages have the same centre + rears speakers (M7C and M7DS) but the difference is obviously in the front speakers - M72 shelf speakers or M73 floorstanding. What is the difference in sound quality between the M72 and M73 main speakers? What are advantages + disadvantages in whther to go for shelf or floorstanders? I know most people go for floorstanders but I am also considering shelf-speaker for reasons of space. Do shelf-speakers for main-fronts justify a Denon 2802 amp? Thanks.