The British 804 love Canadian Solid State Bryston, Classe, Sim Audio, etc. Which are less expensive then, ML, Krell, & Pass, etc. If you could squeeze a Classe CA-300/301 or CA400/401 it would open your ears! A McIntosh MC352 power amplifier, would do the trick too! Your pre-amp can be upgraded later as it isn't the boo boo that needs a bandaid, the priority is the amp I.M.H.O. There is nothing wrong with the Harmonic Tech. I.C.'s, & Classe along with Rotel is now owned by B&W. No need to drive anywhere, as your issues could all end with one carefully researched Audiogon amp purchase, & one swift Audiogon Rotel amp sale.
And yes Stamp, & Butterfly collecting would be less stressful alternatives to this hobby! But the journey to reproduce the sound of live music in your listening area, are worth the efforts of swaping, changing, & playing around till your find your a sound that comforts you after all your endeavors.
Lastly, Even if you spend 15G, or 200G on a system?
If the recording is poor on a cd to begin with, nothing will help!