Are there any (widely) available keyboards out there that feature a "ISO 150" layout, e.g. ISO with 1.5, 1, 1.5, 7, 1.5, 1, 1.5 bottom row?
I know the Matias Quiet Pro does have this layout as does the Phantom.
Both, 75% and fullsize would do as long as it's available with Cherry MX (preferrably blue, but I know my way around a soldering iron, so the switch color is no dealbreaker)
Oh, and USB is probably required although PS/2->USB should work on a Mac too, right?