Before obtaining a Belles 250i Integrated from a fellow member here I would have quickly offered Pass Labs as a serious consideration. My experience with Pass Labs was with the X150.5 amplifier, which became my benchmark for amplifiers. Clean, articulate, uncolored. Made my Thiel CS3.5’s sound absolutely wonderful.
The Belles model I now own is out of production, but David Belles is still in business as Power Modules. Currently they offer the Aria integrated, 75 watts per channel into 8 ohms.
IMHO, based on my experience with this integrated, Belles should be given serious consideration. It’s in almost every way as good as Pass Labs and a helluva lot cheaper. Don’t get me wrong, I’m still a fan of Nelson’s gear, but Belles is definitely a discovery.