Avoid the "Ghost in the Shell 2.0" edition of this film, which was released on Bluray a few years back. For this version, it was decided to "upgrade" the original film with new CG elements, very much in the same mindset as George Lucas and Star Wars. You might think it reasonable for someone to go back, identify weaker scenes in the original, and then attempt to fix the results of budget and time limitations. This is what Lucas did, and even that was divisive for fans. However, that's not what happened in the case of "Ghost in the Shell". Instead, they redid the same big, expensive, gloriously detailed moments that the original splurged on. The result is that some of the film's best shots are replaced with poor quality CG that is jarringly out of place. On the whole, "Ghost in the Shell 2.0" makes George Lucas look restrained, respectful, and subtle.
Oh, and for some reason they ripped out the U2 credits song too. If you liked that track you might miss it.
The 25th anniversary version that recently came out is apparently the theatrical version, so that would be a better bet, although I cannot guarantee it's good personally (I haven't seen it yet).