I've really found regular 720p is a good way to go. I have no complaints from Blight users yet, it looks fine being scaled onto 1080p, but also looks very good (not perfect) on displays like 1680x1050, and others. That being said, I would not go beyond that resolution because you may sevely limit your player pool. I've limited mine a little with that restriction, but 1080p would cut out a good many people. And 720p still looks fine in this day and age--remember, there are hardly ANY ps3 or 360 games that run native 1080p. Heck, most/many are under 720p and then upscaled. Just remember that the amount of crap on-screen is going to have a greater effect than just the resolution. That, and poorly-optimized huge images.