I had a female ferret named Twinkles for 12 years.
I have also had numerous other ferrets. I haven't encountered a 75% aggresion problem but I suppose its true for many that aren't cared for properly. Our ferret would kiss you lips, and bite your ankles!
They play aggresively but not any more than a cat.
You should try a local ferret shelter. I am planning on adopting two from the Toronto Ferret shelter someday...here are a couple links from BC i think
Ferrets can be great pets, but they return abuse with abuse and ill health in most cases.