If this was the UK in the 1980s it should have been Sony and Technics but it had to be Linn and Naim because it was hopeless to blow against the wind.
Today it would be NAD and Dali.
Virtually all budgets and requirements could be catered to and it would be next to impossible to get a bad result.
Even the £700 NAD C588 turntable is probably better than what’s currently being used by 99% of the population.
Dali, as far as I know, don’t make a truly bad loudspeaker.
In any case I’d simply refuse to sell anything I didn’t personally like or believe in.