^^^^yea I don't use a script for this, but that looks like a good option. In Max though, make sure you have your snaps toolbar visible. that option at the end XY is the snap by axis / align thing I love in Maya. It's not as nice as Maya's way of doing it but it's there.
I use the X Y Z buttons in the Editable Poly tools, which aligns your selection to the world, then snap the aligned verts to the lowest one with the regular snap... It's super slow compared to how I do it in Maya. :( I think there are some alignement scripts that alow you to do it a bit faster though...