I have used both a 3d and non 3d 120hz tv's to play on. I switched away from the 3d unit as it had issues with 3d crosstalk and I was getting artifacts showing up,like it was trying to show a 3d picture even though it was set to 2d.
The 2d unit has a fast responce rate and works quit nicely although it still only does 60hz,it doesnt have dvi! Even in game mode it still only runs 60hz!
I had to run my 24in monitor for a couple days and all I can say is I'm glad I have the big screen back. The pixel size is larger and some may not like that but for me it's a great help as I can see dots at long range and it helps when a plane at D400 is rendered at about 2 inches instead of the 1/4in I'd see on my monitor.
I have poor vission so this has helped me greatly,I can sit far enough away that I can watch the screen without glasses.I even went so far as to have a pair of glasses made just for viewing the monitor but found if I moved too much 1 way or the other everything went out of focus.
YMMV.