Intermittent No start.

Thanks Beast and all. That is some good info to help me troubleshoot. I'm going to keep a meter with me on the road and I always carry spare ballast, vreg, coil and ign module. I did notice a while back that when a helper turned the key to run (before start) that I could hear what sounded like a spark jump around the back of the engine coil area. It went away but I will go over the wiring carefully. It was an Arizona car when I purchased it 15 yrs ago and the wiring is pretty brittle. OK. Let's say it turns out to be the ignition switch. Do you guys have any brand you would recommend or what to avoid? Looks to be a PITA to replace.