Love this topic haha, cause I can understand what you mean...sometimes I want a knock me on my ass cigar. My suggestions:
Taboo Special Forces Original
Joya De Nicaragua Antano
La Flor Dominicana Double Ligero (any size)
El Rico Habano (the older ones seem to be stronger but maybe it's just me)
Litto Gomez Diez (Chisel preferably, but cubanos and americanos aren't a joke either)
If you are goin with one of the above and want a strong one, I'd suggest the taboo....I have had friends who smoke occasionally on the cusp of throwing up off them and they're a great tasting great priced smoke too.
Edit: Also I've heard people mention La Gloria Cubanas here but I haven't tried one yet as I'm not positive which one to try...Serie C maybe? I'm sure someone else can chime in on this