Bose with Uflymike is TSO'd as an additional cost option now. Not as standard. And I think you have to ship them the earphones.
It would get my vote as long as the guy in the right seat approves. It's a very intrusive setup for that guy, and precludes any chats with one ear off. I've flown with guys who use it and while we operate over the intercom, even just a chat before start or off intercom when someone else is plugged in is a real annoyance.
I haven't tried the DC pro x but am very keen to. I'm told its excellent. And if the build quality is along the lines of their standard GA headsets it will outlast the others put together.
Shame you don't like the A20. I love it.