JMC BMX - one of the all time greats.
The company still commands major respect over two decades after they closed their doors. It's an iconic brand and I hope that people will also weigh in on what JMC means to them personally.
The frames, forks and components are artisan quality. They were pretty forward thinking in terms of geometry and things like the integrated seatpost clamp (though I personally have mixed feelings about that one). The bikes are a joy to ride. Super dialed.