Hmm this is just what i think.
I have the same problem i want pro but need a new p.c. so let me think ????
NO FRICKIN way i have 6.5 and used 6.0 untill only a few weeks ago and that did me fine ok diffrent if you are one of these people who like to say "i have it" to everything new software that is but unless you intend to have people sit round you when you are making the video in pro once its finished they wont know the diffrence.
I would go back to 6.0 rather than go pro.
its not all about cash its about time and having an idea.
so no i dont think there is a big diffrence at all.