The following thread discusses security keypad options, including the iris keypad and the zipato keypad.
The Iris keypad is zigbee, and has multiple features including a beep and an indicator LED which can be set to show you if the ST security features are armed.
The Zipato keypad is available on both the US and UK zwave frequencies. It has fewer features than the iris device, but it does also work with a Keyfob that you just touch to the device, so some people prefer it for that reason.
For more details on either, see the thread linked to above.