Something amazing - what would you buy

Why confine yourself to B&W?

Nothing.  Ignorance of other better options at a similar/better price.  They are the beginning point.

hah, don't start asking for speaker suggestions here because you will get 12 different opinions, and everybody says their suggestion is the "absolute best".  Speaker choice is almost personal because everyone has different opinions on "what is the best".  I try to respond with how I think something will sound rather than trying to sell one over the other.

Now that we know a little bit more about you, my answer changes a little bit.  If you're 80% movies, tv, sports then your projector is spot on.  I said Mac has good equipment but given how you intend on using that room, you are totally wasting your money on Mac and i don't care how rich you may be.  The projector is so important in a theater room.  You definitely need acoustical paneling and bass traps.  
As other readers stated 90% of the sound comes from the left, right and center speakers.  You mentioned Martin Logan ----decent in wall speakers.  The best I have ever hear for in wall speakers are the Legacy Siljouette,  I say that because from a musical perspective they are outstanding.  Think about movies you are watching....you are not hearing piano chords, guitar frets, sax or cello instrumentation.  You are basically hearing a big tv with an occasional slam.  All of my theater room seating have bass amp modules in them so everytime there is a slam during a movie you feel the vibration in your chair.  
I actually do 50% music and 50% movies in my room.  The Tektons that Eric built for me ( all in wall except for the two subwoofers ) are musical and provide excellent movie theater sound.  You really don't need to spend that kind of money on a theater room of your size.  Again, you are not doing critical listening in a TR, unless you are talking two channel.  .
Find a you tube video of Legacy Silhouettes just to give you an idea on the sound.  Talk to Eric at Tekton and you can mention that he built an unique system for me.  His custom DI in wall system goes for around 8K and that included the sub amp.  Paradigm also has very good in wall systems.  

Man I wish I had your budget.  I would have the best of both worlds.  A world class two channel system that is separate and an awesome theater room system.  I don't know what kind of furniture you are going to put in but I have used 4seating.com for all of my theater rooms.  Two of them had 12 chairs and my current one has 6.  

Take your time and do more research.  Sticking with Best Buy is ok but there are so many other professional installers in every city who can helo you also.