I find I can take two boards that are almost perfect in dimensions and run them through a few times side by side and end up with identical dimensions. To me the 735 is like a scrub plane.
Bill, that is what handplanes do. And they do it better ... finished surfaces. Without dust and noise ... and dust.

You are planning to use handplanes to finish, so why not kill two birds with one stone. This is why you want to use handplanes, not so? This is where the enjoyment starts. There is no sander than can compete with the finish off a hand plane.

Personally, I would keep the planer and sell the drum sander. The planes will do a better job of removing waste fast and getting to a dimension without any rounded edges (which is what sanders can do).

Regards from Perth

Derek