The hai panel is a real processor hog, I use a Qm-rmc to load my program to when using it. So it would be the most exspensive. The nx8e is really easy to integrate with and pretty easy to set up. It is also the cheapest of the three. The honeywell panel works good also. Some people don't like it, but when it is set up and programed correctly it works great. They also have a new versihat of the honeywell that has just been released and that is eight times faster and doesnt need the 4100sm. It has a built in serial port and the model number for it would be either the vista 128bpt or the vista 250bpt.