Norman, don't let yourself be too impressed... : )
Since you can only upgrade one component at a time, given that the Maggies are harder to drive...if it were my choice, I would start with the speakers.
Reason being: the Maggies will force / restrict amplification choices should you keep them and choose to upgrade the amp first.
For speakers, I'd narrow it to a category of speaker type. Since you have had electrostatic and panels for nearly 17 years, perhaps be open to another speaker category.
Personally, I recommend higher efficiency speakers...they will offer you a much broader amplification palette to choose from. And should you choose a higher efficiency speaker you can enjoy them with your McIntosh amp until you are in a position to replace it.
FYI, Maggie 1.7s driven by a McIntosh stack are one of my favorite (top) local audiophile systems.
Since you can only upgrade one component at a time, given that the Maggies are harder to drive...if it were my choice, I would start with the speakers.
Reason being: the Maggies will force / restrict amplification choices should you keep them and choose to upgrade the amp first.
For speakers, I'd narrow it to a category of speaker type. Since you have had electrostatic and panels for nearly 17 years, perhaps be open to another speaker category.
Personally, I recommend higher efficiency speakers...they will offer you a much broader amplification palette to choose from. And should you choose a higher efficiency speaker you can enjoy them with your McIntosh amp until you are in a position to replace it.
FYI, Maggie 1.7s driven by a McIntosh stack are one of my favorite (top) local audiophile systems.