@StephenVA: I installed NGK 3199 spark plugs and went ahead and replaced all the coils.
I verified all the other coils (besides the one on cylinder #5) were good, but I did replaced all the coils. Those were all original (old light brown square top type) or if not originals, quite old so I figured they'd go bad soon too. But I mostly just did not want to hear from my wife about how I am always working on the car.