ok, so which ones do i watch so it's in the right order?
Believe it or not, I don't think it really matters. Personally though, I'd watch the films (GiTS & GiTS II: Innocence) first then work my way through the series and end on Solid State Society. SO basically in the order in which they were released.
As others have pointed out though, they're two very different animals. The films tend to be more focused on the main characters' introspection and are both replete with not terribly subtle symbolism while the actual plot takes a back seat. Also, despite the fact that the first film inspired more than one iconic action scene from The Matrix, both the films are surprisingly slow paced. There's a whole 10-15 min sequence right smack in the middle of the first film where the main character literally does nothing but watch passers-by.
The SAC series on the other hand is a more typical action/sci-fi show in terms of pacing. It still has allot of the cyberpunk themes of the movies, but it the episodic nature of the series allows it to be presented in a more balanced way.
As far as the Ghost in the Shell 2.0 thing is concerned...I think it was unnecessary and you won't miss anything by skipping it. While at the same time if you don't have access to the original version, I don't think 2.0 will detract from the experience either. Think of it this way: imagine if all George Lucas did for the Star Wars Special Edition was to re-render the animation from the Rebel briefing and Luke's targeting screen and change the colour of the wire-frame from green to orange...that's about it.![]()
It's also true that none of the GITS are really that closely connected, the movies are barely related. The TV series, not at all.