Thanks for that. I didn't even think about the Freesync/G-Sync piece of the equation. Doesn't look like there are any 16:10 Freesync monitors available. I think I could deal with a 4" discrepancy from the horizontal to vertical in a 27" monitor. For example, this monitor from Acer is 24.5" x 20.8" in dimensions, which should fill the space up nicely and is not that crazy wide of 5 or 6" in difference.
Two other questions. Any advantages to using a 4K or 1080p monitor? Also, what connections are ideal from monitor to PC? This one has VGA, HDMI and Display Port.