About the only thing not touched upon here is the new metal cutting skill saw type it has a slower turning motor & a carbide blade excellent for big straight cuts .
There is also a chop saw version BUT DON"T try to use the bade in the regular saws the RPM's are too fast & burn up the blade NOT CHEAP!
PS when using a nibbler if you have some old speaker magnets place them everywhere you can to keep the "moons " from flying everywhere & use a piece of tape for a guide line when cutting..
Also ware a old crappy pair of shoes cause those moons get in there & never seem to get them all out.
Hope this helps