The information I have read recently suggested looking at existing and planned projects in order to decide which tool is need first.
I just bought an Ez Smart guide system. It is very easy to create a straight edge or two on dimensionless lumber with it. I wonder if some of the Ez Smart & Festool cutting system owners here have found it possible to get by without a joiner for a while or indefinitely? I think I will go for a planer first. I also plan to research combo planer/joiners since speed of production is not my major issue and I have limited space.