Before deciding on a new resolution, I thought it would be helpful to see what most users have. Unfortunately, that's one statistic the in-game NEO Scavenger metrics don't track.
However, one benefit of running one's own storefront, and hosting one's own game, is that I have website logs to turn to. It's not as good as tracking that info from within the game, but it's pretty close. So I opened up Google Analytics to take a look
Hm, that's not as clear-cut as I had hoped. The top 10 resolutions only cover about 57% of all users. Worse still, look at the lower right hand corner. That's right, there are 1336 different screen resolutions used to view bluebottlegames.com!