OK, I've got a PC version of Rollercoaster Tycoon 3 on PC CD-ROM, but I've upgraded to a Mac (MacBook Pro OSX Snow Leopard specifically) and I want to re-install it.
I understand there are a number of options for running PC games/software on a Mac, such as Wine, VirtualBox or BootCamp.
I already have a Windows XP VM in VirtualBox, but that's slow enough without trying to run something like RCT3 in it.
I know there's a Mac port of RCT3 released, but I don't want to spend extra money when I already have a perfectly valid PC version already.