I'm no expert at this, but from my experience you're not going to cut any haze issues with 1000 grit. It needs to be at least 800, and 600 isn't going to hurt the effort at all. My belief is that wet sanding creates less dust and MAY reduce the amount of scratches, but if you do a good job of buffing, there won't be any scratches anyway. So mostly it affects the type of mess you make. I tend to like the results of wet sanding just a little better. I'm working on mine right now too, and I'm wet sanding 800, 1000, buffing, polishing and seeing some good results. The haze that I'm working on is mild. I did some heavier hazed areas last year and used 600 on most, but started some areas on 400.