As said by others, take some of your own, that you are familiar with, try to include something with proper instruments, preferably played well. And I don't mean classical – anything will do and take some electro. stuff too if you listen to it.
You decide – everyone's ears are different. And your paying for it.
Naim stuff lasts for years – had my 32.5, hi-cap, 140 for donkey's years, guess it needs a service by now but still sounds good.