hhkb supreme layout.
if only it came in 55g
And with a better Fn layout for text editing. Those are the 2 biggest factors preventing me from getting one. They can both be overcome by buying a Realforce 55g and swapping the domes and replacing the controller, but then the overall cost shoots up to a rather ridiculous figure.
Oh, and then you have the lack of aftermarket keycaps to contend with. I'd rather use MX switches with the right weighting, decent layout, great text editing Fn layer and massive aftermarket caps compatibility (KBT Pure with 62g ErgoClears).
Or even better, the custom I will make when my GON NerD60 PCB arrives. Then I can try the HHKB layout with all the other custom MX advantages.