I'm not sure what you mean by high priced, but:
I currently use a PS Power Plant Premier which can be had for about $800. I have been in this townhome 3+ years and have dedicated lines. Until I installed the PPP, there were easily heard changes in the sound of the system at various times. Most notably, there was a hardness in the upper mids that would come and go along with quick listening fatigue. The hardness was there more often than not. The PPP has removed the hardness and solved the listening fatigue issue for me.
In my previous two houses, I had dedicated lines fed from a Topaz isolation transformer (fed from the electrical panel) and that was all I needed for stable consistent good sound.
You won't know if your system will be improved or by how much it will be improved unless and until you experiment.
I currently use a PS Power Plant Premier which can be had for about $800. I have been in this townhome 3+ years and have dedicated lines. Until I installed the PPP, there were easily heard changes in the sound of the system at various times. Most notably, there was a hardness in the upper mids that would come and go along with quick listening fatigue. The hardness was there more often than not. The PPP has removed the hardness and solved the listening fatigue issue for me.
In my previous two houses, I had dedicated lines fed from a Topaz isolation transformer (fed from the electrical panel) and that was all I needed for stable consistent good sound.
You won't know if your system will be improved or by how much it will be improved unless and until you experiment.