Ghost In The Shell Stand Alone Complex

I've been slowly building a collection of DVDs for this series, so far I have found volumes 1, 2 and 5. At the weekend I watched volumes 1 and 2 and have to say I was impressed. It is about a crack anti-crime unit called Section 9 who seem to have some kind of government funding. It is set in Japan and the unit is led by a guy with white hair that sticks out around by his ears, sort of like a mad professor. He seems to be the strategic lead but the action based leader seems to be a female they call the Major. She has had most of her body replaced with cybernetic enhancements. She is the character on the box cover with the impressive breasts. I don't know why she wears the costume she does but she runs around half naked when she isn't inside a spider/tank thing. The series has episodes that link a larger story together and these are interspersed with standalone episodes, hence the stand alone complex. I enjoyed watching them and hope to find the other volumes sometime. All the volumes I've picked up so far have been from charity shops. I don't know what relation this anime series has with the Scarlett Johansson film just recently released, I think the female lead is supposed to be the same Major. I hope to go and see the film this week, so will find out.