My vote would be for the following:
Baldur's Gate (enhanced available for OS X)
Planescape Torment
Icewind Dale
The above are all 2D and run fine in Parallels here. Also these games which followed although 3D run on Parallels as well:
Baldur's Gate II (enhanced available for OS X)
Icewind Dale II
You can get all these games on GOG.com or for the enhanced BG games, on the Mac App Store.
I hope you like classic RPGs.
You can find quite a lot of good old classic games on GOG.com which would run fine in Parallels and in some cases they have already set them up to run on OS X using with Wineskin or Boxer. In fact, I think some if not all the games I mentioned above are setup by them to run in OS X with Wineskin although you also get the Windows version too if you prefer to run them in Parallels for some reason.