Thanks Ed. So it sounds like the SR7008 is sort of positioned in between the X4000 and 4520CI. I hadn't looked at it closely but it's good that Marantz finally added XT32 and 9 amp channels to their "flagship" receiver.... previously the 7005 et al were pretty underspec'd compared to the 4311.
I do find it kind of curious that the SR7008 is only spec'd at 27lbs, 9oz. That's barely more than the X4000, despite the Marantz being physically larger (deeper, taller) and having 9 amps. And looking at the back the X4000 power supply spec is 670W vs. only 710W for the SR7008. I would think it would be rated higher, and weigh a few pounds more, all things considered.