Hello marksiebel and welcome to the club the perfect setup for your 18" kettle would be the cajun bandit stacker,coal ring and diffuser. It gives you two levels to smoke on just like the wsm and with the one touch cleaning system you have the opportunity to sweep the bottom during long smokes. Cant do that on a wsm or a jumbo joe and I've got both. I also drilled a hole and installed a wsm grommet, for my toys of course. I'm gonna guess since you have an 18" kettle, you dont want to clutter up what space you have and you'll be smoking as well as the pro's. Let us know which way you go.