What is a good belt sander at a reasonable price
Milwaukee is known for making good stuff. Every red tool I own works just like it's supposed to. But that sander is (what we would call) a 4"x24". That's a big belt sander for sanding doors (and a beast if you need to use it vertically). You might be better off with a 3"x21". When I was researching/shopping for a belt sander, the Porter Cable, Makita and Bosch got good reviews. I ended up with the PC 3x21 variable speed, and have had no complaints.
One thing I've figured out about belt sanders. Unlike a saw that makes a cut and gets switched off, a sander runs for extended periods. A cheap one is gonna burn up.
I've bought a Random Orbital sander since the belt sander. I'm impressed with how versatile it is, with different grit discs. With a coarse disc, it's reallly fast. A fine disc makes it a decent finish sander. One of those may be a better choice for your project.