The Samsung's are reportedly among the best TN panels, so they aren't like other TN panels. The viewing angles on IPS will be better but the colors on the Samsung are already pretty good.
One thing that needs to be considered is motion blur -- have you ever done the Samsung Zero Motion Blur HOWTO
? If you loved the motion clarity but hated the color degradation, you may wish to consider the Eizo FG2421 instead, since it has a "LightBoost" equivalent in a VA panel.
(Samsung Zero Motion Blur mode, LightBoost mode, and EIZO Turbo240 mode, are all strobe backlights -- see list of 120Hz monitors
60Hz = baseline
120Hz = ~50% less motion blur than 60Hz
strobed = ~80-95% less motion blur than 60Hz