I think power tool selection is a never ending debate candidate.
A 6" bench grinder with scotchbrite wheel. While this could be skipped, it is a very basic and constantly used tool. I think it is expected that all builders have this.
Air compressor. Anything will work but there are differences in performance. "oil-less" are usually noisy enough to be undesireable. HP rating is going to be a selection depending how impatient you are. You will have to wait for small HP compressors to catch up when using air tools.
A drill press (bench model is fine). Try to get one with slowest low speed as possible. This also could be skipped, but there is a safety aspect when cutting large holes with a fly cutter and a hand drill motor. Secondarily, accuracy and perpendicularity of holes are sometimes important.
DRDT-2. While not a power tool, It is pricey. I would put it ahead of the sander and band saw.
Bench mounted Belt/disc sander. I did not have one of these however if I built again I would get one (and before the band saw).
Band Saw. I did not have one during the build. For the few pieces that needed sawing, I used a hack saw. Either way, the part should be filed to final shape so the cutting method is not highly relevant. Saw usage is higher during fuselage construction compared to tail or wing. Quickbuild folks will hit this earlier than standard build folks.