Just my $.02 but I would do the Byrd Head on the planer.
That's what I have on mine and I like it a lot in regard to the quality of the cut, how quiet the planer is, and not having to fool with changing knives.
Expect to upgrade my jointer to a byrd head in the near future.
To me, While the drum sander would be great to have, but it's a separate tool and topic from the planer.
PHM