"The Au24 is likely warmer? without losing the great tone? excitement? or punch?"
Yes, the Au24 will probably provide the attributes you desire, but they would be the highest quality component of your system by a wide margin. They would be something you could build a system around, if you ever desired to do so in the future. Today, it would be like putting solid gold rims on a Pinto.
I would highly reccomend the Speltz Anti Cable for what you are seeking...