The path of least resistance: All GOG games that are on DOSBox, which play equally well on Windows, Linux, and Mac machines
You are not going to get the Mac or Windows native versions of this game. They won't act like the Mac or Windows versions of this game. It's not that GOG is lazy, it's that it isn't doable. SimCity 2000 had the bad luck of showing up right around when operating systems were in flux. DOSBox is an environment that works consistently among platforms, and it does it quite well, and the DOS versions of SimCity is what you'll get.
As a Windows user, I feel your pain, because I played SC2K on Win 95 and I had a way better set of tunes to go with my memories. But it isn't so bad playing the DOSBox version, which already uses backwards Apple conventions (drag-down menus, no real left click support, etc.)
Still, $3 gets you a lot of nostalgia for the buck during this sale.