This thread again.
I have ~600 unbeaten and unplayed games.
Caveats: This is includes collections and packages where I may have only wanted 2 or 3 games but it came with 30. So I don't intend to beat every game on this list. This also has a lot of games in series. Like I own all of the .hack games, but only beat the first. So I got 6 games to play that I only bought for later. This is also true for DMC, Arc the Lad, Disgaea, Fatal Frame, etc.
There may some inaccuracies to my list, which is why I have undershoot the number a bit.