As you could guess, I love severe much more than snow. You mention towers in your post. Well, you haven't seen anything until you see towers rising all around you from the mountain ranges during an Arizona monsoon while it's clear on the valley floor. It's kind of like a ring of fire, and you watch the sky and the radar wondering which ones will build into a super cell, and which ones will drift down out of the mountains and into the valley. Unlike here in PA where they mostly roll in from the west or northwest, a cell can come from any direction at anytime, and occasionally drift from multiple directions and come together into one immense storm.
One of those happened when I lived out there as a storm came north from Pinal County and Gila Bend, one drifted south from Lake Pleasant, and the other came in from the east out of Mesa. They hit West Phoenix and Avondale (where I lived at the time) with such a vengeance as I'd never seen before. Lightning that wasn't CTG stretched from one end of the sky to the other in a near strobe light effect for nearly an hour.
Then there's the outflow induced haboobs, or duststorms, which can be incredibly amazing in their own right.