Safe to say then, as Dave has just confirmed in so many words, there is nothing on the Market today to replace the omega head units without major compromise in some area or another .
Including this one. Sadly. Quite like the look of it actually. But there we are!
Depends on your priorities.
I've stuck with standard (even though a bugger to retrofit in the MV6) because I want the OEM look and full functionality from the onboard systems. And Bose 
Priorities are... Everything. Everything must be better. As if vx had developed the system to currant day. Bc,tomtom nav, double tuner for tmc, check control, 4 stack cd changer will do, phone with blu tooth that can stream music, iPod connectivity, tv, video playback.all through CID and Bose, because anything else will be a step down. Although lower volumes need work with Bose fair enough. But crack up the volume it's bloody good IMO. Certainly don't see/hear ANY need to spend money there.
Or add some of those newer function to the current set up. An aux in would be a start. I do love the way external audio mutes your current selection with a modulator. Gives an "as designed feel", shame there's that little bit of hiss, although road noise and higher volumes drown it.
Or, what's the next step up? Cd70? Dvd90? Dave already said BC functions will be lost.
I suppose logic suggests develop the current set up, as it is bespoke. CID,2015,Telematics,steering wheel controls, check control. Nothing can replace that. Therefor, it is the best System available for the omega. Regardless of weather Dave likes or not.

I mean why would anybody develop a system for dieing car like the omega? No money there, it's a hard to beat system with no way of clawing back development costs.