I also think 5e is almost certainly sufficient for the forseeable future, but you could use cat6 cable but not cat6 stuff for everything else. If/when you need the full cat6 capability you can always ...

Someone installed my cat6e wall jack using the "A" pattern. (The A and B patterns are printed right in there to compare with the actual wires.) I checked it and it's "A". I have now put an rj45 plug ...