Are you proficient enough to do a home build? Then you get to cherry pick some pretty nice transformers and valves. £300 will build you an amp that will blow most things out the water. £600-700 will build you something that even 6-figure amplifiers will struggle to match.
Thanks again @Stevethecoffee 👍
And also thank you @Airhead & @ChasnotRobert - very valuable feedback for me, I appreciate it!