I need to run SPSS (statistical software) on my mac for school. I have played around with the SPSS version on mac computers at the library and it is very buggy. I am thinking of getting either vmfusion or parallels to run Windows 7 and then getting SPSS PC versions that are much more proficient and effective. I purchased my Macbook Pro a couple weeks ago, but have not upgraded the ram from 4 to 8 gb yet. Can anyone provide me some opinions as to whether vmfusion or parallels works better, of it's personal preference? I know that either will work, so the most important information I need, is how much ram I should allocate to make sure that it runs smoothly? Should I wait till I am able to bump up to 8gbs before doing all this or what are your thoughts? Thanks for helping out!