Do the upgrade, you will *definitely* hear an improvement. The receiver/amp can wait, you'll still be getting great sound in the meantime.
In addition, you might want to consider upgrading to some used 100s V2 with the real wood sides. You can get those for about the same price as the new 60s V3. They will go much deeper and look *fantastic*, especially in the cherry or rosenut veneers.
In addition, you might want to consider upgrading to some used 100s V2 with the real wood sides. You can get those for about the same price as the new 60s V3. They will go much deeper and look *fantastic*, especially in the cherry or rosenut veneers.