My shop is fairly complete, as I've purchased tools as the need has arisen. My current array is:

Cabinet style Table saw with 60" rails
Router Table in end of table saw
14" Band saw
Compound sliding Miter saw
Floor standing drill press
15" 4-post Planer
16" open end drum sander
Festool EQ55 Track Saw
10" Swing lathe
Plenty of small tools such as routers, biscuit joiner etc

So, as you can see, the glaring omission is a jointer. It has never really bothered me not having one, as I just use other methods to accomplish the task. Edge jointing is accomplished with either the Track saw or the router depending on the length. Trickier is the face jointing, as I have several sleds for the planer, but really long stuff is a problem. I usually circumvent that by rough cutting the lengths needed prior to the planer.

Finally, the question. My shop is quite small and I already keep both the planer and sander on mobile bases and get them out to use. Would you consider a jointer that will also need to be mobile or is there another tool that I'm overlooking that would be a better investment? Maybe I should consider my collection complete?