I think the right question is, "Under what conditions will I be able to
hear a difference, when changing equipment?". When this becomes
the issue, then the equipment, and whatever dollars it represents,
is relegated to a different role. What do I mean?
Instead of searching for the Holy Grail, or the one piece or
combination of pieces that will be most satisfying, I suggest
you focus on two variables, only. And they may not have occured to
you, or been mentioned to you, yet!
The first one is the organ you use when you listen to music...
yes, your ears! I recently discovered that a cleaning kit from
Rite Aid made it possible for me to experience more of an emotional
connection to the music. Sure, I thought my ears were clean,
but those canals go pretty deep, I learned. Another option
is a professional cleaning, which I last had done over twenty years ago!
The next point of attack, with exactly the gear you already own,
is "vibration control." All electronic pieces are subject to internal
as well as external vibration. What are you doing to address this?
IMO, the finer your gear, the more you will be able to appreciate
the effects of the proper treatment, in this area.
The challenge is, this will take a bit of time and effort.
The retail store is selling the high dollar gear because that generates
the most profit, for them. They might not want to talk about
the lower cost alternatives that can efficiently improve your sound.
Wouldn't you rather be happy with what you currently own,
and have the feeling that you are absolutely getting the most benefit
from each piece?
What to do? There are posts here, that address vibration control,
from manufacturers such as Stillpoints, Symposium, Marigo, and BDR.
And you might pay attention to the rack or furniture
that is supporting your equipment, and holding your cables.
There are online and catalog retailers (Music Direct, Audio Advisors,
The Cable Company) that can open up your world to many different options. And you may even choose to audition them, with the ability to return them if you are not happy.
Lastly, check out Jim Smith's book, "Get Better Sound."
I can't imagine anyone with an open mind who has failed to
glean some great ideas from this book.
"Just have fun." For me, it is very rewarding to initiate a
change that improves the listening experience, and does not involve
spending a ton of money! This way, the journey can be as
enjoyable as the destination...