Hi Dick,
The belt/disc sander you show looks like it would do the job. You really will find yourself using the disc a lot.
On the rotary tool question, I would definitely get a corded Dremel. The last one I got (first one lasted well over 30 years) is the multi speed version and I also got a flex cable for it. I have the cordless version also, but the batteries are holding less charge, it seems, every time I use it now. It IS handy for some jobs, but the corded one is the way to go. And the multi speed version comes in quite handy. Get the adjustable chuck for it, they are cheap and makes bit changing a breeze.
Big Bear