My next upgrade will be tires. While I like the trigger sport tires, I have had 1 flat due to a nail. Which I blame the portion of my neighborhood with homes being built.
But I have been going back and forth from various tires from Michelin, Schwalbe and even some of Specialized tires specifically thinking of these:
Specialized Bicycle Components
I'm planning on buying a set of tires for the road like above and another set for trail usage.