In looking at the Marantz 5007 Bluray I see it lacks a 7.1 output as well as RS232 connection. The Oppo also has USB inputs and HDMI inputs for switching.
We are Marantz dealers and we have yet to sell a Marantz bluray player. we only sell the Oppo's. we are also direct with Oppo so that helps a bit.
On a budget job we will use a sony or something easily controlled
There's no worse feeling than that millisecond you're sure you are going to die after leaning your chair back a little too far.