Just my 2 cents worth, but I think, for star pointing more than 45 mW is clearly not best.
Get a 10 to 20 mW. I like the LaserGlow Galileo, Good as supplied (<5 mW), and these turn easily to 20 or even 30 mW with an easy pot mod.
I really like a pointer not to undo my eye's dark adaption. I think ~20 mW is great, less is O.K. if there is stuff in the air, (pollen moisture dust etc., then, maybe use about 5 - 10 mW), these work well also, if you have very keen eyes, and want to save the eyes from too bright a flash when a object is close by, and dotted unintentionally (such as a overhead tree or moth etc.) It also depends on if you want to see very dim objests, I was able to see an asteroid which the ~10 mW green laser (mounted on compuer guided telescope), helped me know exactly where to look. Had I used 45 mW I would have not seen this!