Yamaha RX-Z1: 153W x 2 Ch 8 ohms, 258W x 2Ch 4 ohms.
Yamaha RX-A3060: 186W x 2Ch 8 ohms, 294W x 2Ch 4 ohms.
If you're using the Z1 now in your room, then the A3080 would be a good replacement for 4K/Atmos/DTSX. However, if you want Auro3D, then you would have to look at Marantz, Denon, or AudioControl.