Sadly I think the most cost-conscious way to get truly great quality audio these days is to buy/restore used vintage equipment. There isn't really as much of a market for high end but still affordable for mere mortals audio equipment as there was in the past. Prior to the invention and proliferation of home video playback which started in the late 70s and later the proliferation of home video game consoles people used to spend most of their home entertainment budget on audio equipment. The budget you'd set aside for buying a large TV, a few game consoles, etc. instead would be spent on a stereo so there was a much bigger market for audio equipment in what would be the $1-4k in today's dollars range.

Personally I use a set of big box speakers made by Bozak in 1958.