Hey Cary, brand spanking new here. I heard about the site from Steve and decided to register. Anyways, back on topic...
I will be in Vegas from about March 26th through April 2nd, let me know if your going to be around and we can possibly meet up and talk trash about Steve together
I have a shot of Magni from 2012 and I just checked the date on it and sure enough it was a Thursday. Janet will almost always depart 1/19, and for the most part will land there as well, but they will arrive 25L on occasion (I've probably seen one arrive 25L on average at least once a day when I've been up there).
You could also try North Las Vegas (KVGT), I've never spotted there myself but I know Vision flies their Do-228's in and out of there on a regular basis.
Let me know if you need any more info on Vegas and/or Phoenix.