As someone who was into DH back in the day, an Intense M1. I was lucky enough to have owned one and it was everything I ever hoped.
Amongst others I’ve also had Orange (original Clockwork, 222 and 5), Turner (5 spot) and Santa Cruz (Bullit, Bronson v2 & 3).
Mostly acquired 2nd hand.
Can’t say I’ve ever had the desire to own an On One, the aesthetics / graphics are generally awful.
Other historic brands I’ve also owned include Peugeot (early atb), Raleigh (team burner) and GT.
I’m only just getting into road, not sure what my aspiration is there yet.