I have an IMAC OX S, which has been upgraded to an 10.9.3. I was told Parallel 9 for Windows would work on my computer,but first I had to buy a Windows operating system and install it. Can anyone advice if 7 or 8 is better and can I just buy the one for $70 rather than the one for $240 or so? The main reason I would be using Parallel is for playing games that work in Windows, but not on my MAC - that