I'm writing this on a RF87 45g. The feel is a nice, but I'm curious what else is out there, as I've only tried blues and browns besides this

45 is on the light side, so I'm weighing options against trading for a RF 55g.
Watching some footage of black typing, I have to say that I'm not impressed by the no o-ring sound:
However, this one sounds much nicer (slightly misleading though because it's in a dampened room, for sure):