Sonically, an old ARC LS-3 with a Threshold T200 power amp and Martin Logan SL3s. I forget what the T200 replaced but it was a lesson about auditioning first, especially at that high price (even back then). It was listenable for twenty minutes at best. Sold the T200 very quickly because it was a great amp, just not with ML speakers. An oops moment/decision.
Monetarily, a guess my lovely burl Raidho D2s paired up with less than $6k retail worth of source/power electronics/DSP/cabling. Oh, plus three good subs ($2200) for 25-35Hz reinforcement. To me, the sound is from heaven, the best I've had after forty ears despite owning any super $$ electronics. (Yes, if I had the money it could sound better still, but diminishing returns sure set in.)