Mihalis, get those ads posted! Again you are very fortunate to have this luxury, you are the envy of many, myself included. Too often I have ended up with 2-3 of the same component to compare side by side and end up keeping one and then replacing something else, only to find what I have already sold may have had better synergy.
You should offer listening sessions as you can provide much better comparisons than virtually all dealers.
Best to you and enjoy to the Nth degree.