I would get it running and ride it some before throwing money at upgrades. Your springs might not be that bad. I still have the original springs in my 88, with a set of progressives that have been sitting on the shelf for about 4 years now.
I have restored an OEM windscreen to looking almost like new by sanding it with 400 wet, then progressing thru all of the grades to 2000 of wet paper, then using several grades of polishing compounds. You have to be super careful cleaning it after this because it will scratch very easy, You just removed the protective hard coat from the factory. As long as you are not real abusive this will get you a couple of years good service out of it.
And what Dan said about the rest of the stuff.