For myself, although I've had many different receivers and integrated amps in my life over the years, my current amplification in two rooms is pretty modest but quite enjoyable:
1973-74 vintage Marantz 2230 receiver, bought used and meticulously restored by a now-defunct used-audio dealer 12 years ago for $90; and
2001-vintage Sony STR-DE300 receiver, bought used in impeccable condition for $20 from a local Goodwill store (sold for about $150 brand-new), much better sounding than I could have reasonably expected.
My vintage Marantz remains quite a nice piece of gear, wish I had snapped up more vintage Marantz receivers in the past when they were plentiful and cheap on the used market. The slightly newer Marantz receivers from 1977-79 with the gold-finish tuner front instead of the blacked-out front (i.e. 2238B, 2265B, 2285B) apparently have the best-quality tuner sections.