Hi, below are the collected responses to the query I put to the group about touch screen monitors. I ended up ordering the 3M M170 Touchscreen. Since the VA takes forever to process orders, I can let you know how they work sometime next year hopefully...
*********We use 3M Touchscreens with USB connection and with capacitive tech. We used to use resistive ones, which are supposed to be more sensitive, but they would lose calibration quickly. These ones are good and the company has been helpful with warranty.
We bought a version of the NEC AccuSync LCD72VX-17" Touch Screen Monitor. We haven't really used it much when running subjects (as a touch screen), but it seems to work fine overall.
I used an ELO touch screen for my experiments.