I'm pretty new here too, so I don't have much to offer in the way of advice. However. . .
I'm also a long time Mac user. Lately I've been considering a move to Ubuntu -- at least for some things -- and I find I still prefer a Mac keyboard layout with Linux. Typing right now on a Matias Mini Tactile Pro that I added O-rings to, and it's a very spiffy little keyboard.
Going forward, I think my focus is going to be on fully programmable boards with split space bars. Banana Split 60, I hope!