TouchScreen Monitors

Pretty much all I do is desktop apps for touch screen.. for testing I use an HP Compaq L2105tm - a cheap-o touch monitor. Normally it's fine, but am working on an app that will be used by multiple people at the same time and now the monitor is proving not competent enough as it only supports two touch points.

Can anyone recommend a good monitor that supports more touch points in AIR apps? Looking at the Planar PXL2430MW but can't find much info on number of supported touch points.

Thanks