Hi. I am considering investing in a nice big set of speakers. I was very impressed with a friend's Mirage M1 bipole speakers- the sound is something I really like, with the open sound stage, quick response yet smooth sound. Does anyone have any input for either of these two? I'm thinking with my room size, a set of OM-7s are more than enough, but would the OM-5s be better sounding? Also, as of right now I only have a Denon 3803 receiver/amp. Would it be a waste to power these speakers with the 3803? Do I need a nice dedicated amp? THanks for your input!