Best "Bang for the Buck" you have owned?

An Arcam FMJ integrated from about 10-15 years ago. I’m thinking it was the A18. Anyway, it really sounded great on vocals

Clearwave Audio Duet 6 Monitors. I paid $1000 for these speakers but once I received them one clearly had a bent grill which the driver would vibrate against at loud volume. The seller refunded me $200 and got me a replacement grill so I paid $800 for these.

They use Accuton ceramic drivers, top notch xover parts (mundorf, clarity caps, supra wiring, cardas solder, etc.), and a 2" baffle and rock solid cabinet. They retailed for $3k direct from Clearwave, but if sold through retail channels they would likely be $4-5k. I bought them on a whim driven by Covid-19 boredom/anxiety and once paired with dual REL T5i subs that I also got used they wound up replacing my Salk Song3’s which are now in another room. Total with the subs I paid less than $2k. No way I can do better at that price and based on the value alone I don’t think I’d ever sell them.

RPi 4
Allo DigiOne Signature Player
SMSL SU8
Crown xls 2001 amp

All for under $1,000 and the sound is phenomenal

Marantz 8 $250.
Quad 57 $500 including shipping crates.
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I'm pretty shocked by the price / performance of the mhdt labs "orchid" dac I purchased this year ( with tube adapter to 6922 ).

Reference  3A Decapo 40th yr Anniversary  edition  has gotten me off the upgrade path. They are incredibly  good music makers