If you were a fan of the IQ Panel 2, the current IQ Panel 4 uses the same user interface. The IQ Panel 4 is the panel we recommend and sell.
Are all of your existing sensors wired? If there are any wireless ones you should consider using a 345Mhz IQ Panel 4 to make use of existing wireless sensors. If they are all wired, the standard 319.5Mhz model in our bundles linked above would be recommended.
Various guides are available for programming depending on the panel type you choose. Assuming the 319.5Mhz IQ Panel 4 is used, a sensor guide is below:
Here you can find a Z-wave guide:
These are the same as the steps in the IQ Panel 2.
For hardwired sensors, you can reuse them with a wired to wireless translator. Options for the 319.5Mhz IQ Panel 4 are below: