I have also considered the possible upgrade of the 2 channel speakers.
However, due to the personal preference, I may stick onto the Avalon series.
Hence, the likely upgrade in the near future will be the Avalon Avatar's bigger brother Ascendant.
Hopefully after the completion of my home renovation, I will carry out serious consideration and audition on it.
In fact, I have not changed my present HiFi combo for nearly 10 years and they are still:
Mark Levinson CDP + Mark Levinson Preamp + Krell Monoblock Power Amp + Avalon Speakers
The above combo suits my personal taste on sound characteristics so will keep using these combinations continuously.