The cast iron smoke pot seems to be pretty popular here and that is the route I took. I use it for the low and slow cooks and it provides plenty of smoke for my taste. Dennis also sells a cold smoker that can be added to the built in port if you wanted more smoke. You could also use chunks or chips with holes punched in some foil. Lots of ways to approach it.
I have used many grills over the years from dedicated smokers (gas and electric), offset smokers, pellet grills, and Weber gas grills. The kk serves all my needs and gives me the control that I want so I don't have to stay up all night babysitting the grill.