+1 for the older style WSM.
If it's in good shape and the pieces fit together snugly, I'd go for it. You can add a lid therm if you like, and same for a larger water pan. But those parts aren't at all essential for successful cooking.
(One thing I *wouldn't* do is clean that WSM back to shiny-- at least on the inside. Unless it smells funky, you're better off with that gunk, which helps to seal up the sections and keep the smoker cooking at the proper temps.)