Im not sure what the Pittsburgh roster looks like but I think the perfect ending to his career would be with the Penguins.... classic Jagr.
Loaded with RWs to begin with (plus Sprong knocking on the door for a chance) and employing a system that puts an emphasis on speed. As nice as it would see Jagr in a Penguins jersey to end his career, the time for that to happen has passed (barring a symbolic one-day contract sort of situation).