I use a 45mW for Starpointing myself but ideally, anything around the 30mW range is probably the top level of output you would want to be using. The minimum "ideal" output for doing "startours" with small groups of people in regards to 532nm (green) lasers is around <20mW.
You can actually use lower powered lasers from <5mW upwards although the beam on the lower end of the scale is really visible to just yourself and perhaps the people standing beside you - unless you are have some atmospheric particles that will enhance the beam. Living near the ocean will therefore require a less powerful laser since the beam will be more visible in the salt-laden air. As you get closer to 10mW the beam is more visible to those a few feet away than a lesser output. For larger groups of people, the beam from a 10mW is surpassed by <30mW. I don't think it's necessary to exceed <30mW for Starpointing.
Most astronomical suppliers were suggesting <20mW about this time last year. I think one of the models was called the "Starfinger II" although it's possible that the website had a typo and it was in fact called a "Starfinder II". That particular model came with two ring-clamps and a mounting bar which was designed to allow the device to clamp the laser to the actual body of the scope. The ring clamps were to allow small adjustments to the beam direction. For simple handheld starpointing, a typical "pointer switch" (which only remains on whilst the switch is depressed) is best. For mounting to a telescope, you might want a selective on/off switch that will remain on or off depending on the switch setting.
