I'd say that since you already have a wsm, you might wanna try the akorn (HD performer style) or UDS/PBC.
But, if you want two of the same thing so you don't have to mess with anything extra- just have a second wsm and do everything the exact same without messing with it, that wouldn't be a bad option either.
Everyone says good things about the Big poppa smokers UDS, but I can't understand why its that high of a price without getting an actual barrel.
Weber One Touch Gold
2001 Weber Genesis that is no longer used since the OTG