LOL... Looks like we are in search of the same criteria. You being a GMA man I'm surprised you aren't considering the C-3. I imagine your concern is the same as mine... narrow sweet spot. You may want to also throw in Anthony Gallow's Ref. III's. It's suppose to have a huge sweet spot, with good dynamics, transparent imaging and very musical.
I'm not sure what your budget is, but here is an excerpt from Wilson Audio's Alexandria X-2, which sounds like it would meet your criteria:
"Alexandria is the fruition of a blank-slate approach to creating a new flagship loudspeaker for the real world. It introduces radically new technologies, such as Aspherical Group Delay, and capitalizes on the synergistic application of technologies perfected in the decade since the X-1 platform was introduced. The design goal was to extend the musical beauty achieved by MAXX®, WATT/Puppy® System , and Sophia into a system of unprecedented dynamic impact and resolution.
Alexandria's revolutionary Aspherical Group Delay employs upper frequency driver modules that adjust linearly to optimize time alignment. Additionally, each module also rotates on its polar axis in order to achieve optimal driver dispersion for nearly any size room and for multiple listening positions. Alexandria is the only speaker on the planet capable of this refinement."
I'm not sure what your budget is, but here is an excerpt from Wilson Audio's Alexandria X-2, which sounds like it would meet your criteria:
"Alexandria is the fruition of a blank-slate approach to creating a new flagship loudspeaker for the real world. It introduces radically new technologies, such as Aspherical Group Delay, and capitalizes on the synergistic application of technologies perfected in the decade since the X-1 platform was introduced. The design goal was to extend the musical beauty achieved by MAXX®, WATT/Puppy® System , and Sophia into a system of unprecedented dynamic impact and resolution.
Alexandria's revolutionary Aspherical Group Delay employs upper frequency driver modules that adjust linearly to optimize time alignment. Additionally, each module also rotates on its polar axis in order to achieve optimal driver dispersion for nearly any size room and for multiple listening positions. Alexandria is the only speaker on the planet capable of this refinement."