65% or HHKB layout would be nice..
The OG has a space-bar only bottom row, a more modern approximation would be the HHKB layout.
You could also consider the CA 66 layout for HHKB + 65%. I think it would also look nicer/closer to the OG's full size.
Personally I like both 65% as well as 60%, however with 60% you have better PCB compatibility and cost savings...