Paralells is the best program out there.... I am running an old OSX, Mavericks to be specific and so I wanted to make sure I ran an older Paralells. (The latest Paralells does not support Mavericks)
I got windows 7 for about 30 or 40 bucks, and Parallels 9 for 15 bucks. Only place I could find Paralells 9 was on amazon.com and I had to order it through the mail. I couldn't just get the product key. (figures :P)
Anyway, it came in the mail everything works great! Its a bit slower then running Galaxy directly from your mac but its better then nothing.
However, if you want to run windows 10, you might need a newer version of Paralells, Just make sure whatever version of OSX and windows you are running, you get the corresponding paralells to go with it. That's why I went for 9 because I'm running Mavericks and windows 7, two older OS's.