Keep in mind that 8.1 is free if you already have 8.0. There is talk that 9 should be a free upgrade too, but I'll believe that when I see it. I wouldn't put off updating to 8.1 in anticipation of 9.

I also recommend unzipping the drivers into their own folders. It speeds things up when the time comes. I'd install the chipset drivers first, then video, sound, network etc.