I agree with others that the preamp is the most important component. I should say “amplification “ is the most important thing to build around. Take two identical pairs of good speakers. Power one pair with top notch electronics, power the other pair with a receiver and the difference should be pronounced
My formula has been buy the best speakers that I could afford, then when I upgrade my electronics I do it on a larger scale, better than most would spend , but then once the electronics are sorted out get even better speakers , repeat.