Well, no responses, but I thought I would document my progress in case it might help someone in the future with this problem.
Nothing worked with the Nvidia drivers. I tried Powerstrip, custom display drivers and still even though the reported resolution on the PC was 1920x1080 it was still actually only at 1600x900 on the TV.
Video looked terrible at that resolution.
Reverted back to a clean install of Windows 8 using the generic display drivers an voila, it worked correctly at 1920x1080 and everything looks great.
I definitely want to use some version of Nvidia drivers so that I can utilize all of the capabilities of my GT 640 card.
Will post more if I have any success.