Accuphase e800 or luxman m900u for sonus faber olympica nova 3

Hi all
Currently I have an aw250R electrocompainet equipment and I pre-loaded 4.8 mk2 with some sonus faber olympica nova 3 and I am thinking of improving my amplification.
I like the accuphase E800 and the luxman 900 preamp and stage.
They offer me the C900 exdemo at a good price, about 8000 Eur and giving my previous would stay at € 6750, they offer me very little for my previous when it is not a year old, it is practically new and costs 3 times more, you think it is worth it the change.
The idea was to take the previous luxman and leave the electrocompainet stage for a while until we could go through the luxman stage.
I would also value other brands that you would recommend if with this I make a leap in quality, I have also looked at pass, I do not know the model, but it may not go wrong with my boxes.
I appreciate your opinion, I have to make a decision soon.

Thanks a lot
Greetings to all