I think you will be very happy with the system as described, especially having a friend in the biz floating a sweet $. You didn't want to leave this thread w/o some 'constructive' input though, did you?
Just some thoughts in no particular order:
· I agree with XJ6, look at Oppo, either their BDP-95 or BDP-93, with the DAC's in the AVR / Pre - Pro you are looking at, you could save $500 and go with the 93 (you would not necessarily need the DAC's in the 95). I own a 95, I have an old processor, and it lives up to its rave reviews. Don't worry, the Marantz Blu-ray player is also an excellent unit.
· I see you are buying amps from Marantz, have you considered the Marantz AV7005 AV Preamp/Processor instead of their SA7005 Receiver? I think long term you might be happier with the sound & video. I do not want to start an argument, there are strong valid arguments either way, this is mine
· Do you have options on your choice of the Panamax M5300PM? What is your electrical situation? Do you have your system on a dedicated circuit(s)? Since you are still in construction, I would make sure you have your theater on dedicated circuit(s). Clean power can have significant impact on your system. I guess I am saying not to take this aspect of your system lightly.
· Cables? Another topic with a plethora of arguments. Do some research, you will see.
You are very fortunate to be in the situation to build a system from the ground up, have fun.