Considering all of that, a high contrast grey screen is my first choice for the Pro8200 projector. Sure, if you have the right room, and are watching sports primarily, go for a plus gain white screen for the brightest image, but you'll lose the ability to control side ambient lighting.
If you are looking for portable screens, for taking the Pro8200 on the road, the lightest are generally the pull-up screens like the Da-lite Insta-theater screens. Most screen manufacturers offer a couple of sizes. Those screens can weigh from under 10 to 25 pounds depending on size, and will fit in your favorite SUV (or even a car, with, say a 60" diagonal screen). Tripod screens are still around, but generally heavier.
Remember, the Viewsonic Pro8200 projector is a 1080p, that is, it's a widescreen projector.
So, if at all possible, you'll want to match it to a 16:9 screen.
The one exception of course, would be for home theater, if you added an anamorphic lens. I really don't think that's likely though. If you can afford the lens (more than the Pro8200), then you can afford a better projector.
Bottom line: As usual, match the screen choice to not just the projector, but your room environment, and what type of content you watch (and how you like to watch it).