Someone needs to do some research to find out who makes the Belkin UPS -- I just checked their website, and they don't say they have the ability to manufacture UPS units (for OEM sales). Interesting. I did a brief search, and it looks like OPTI-UPS has a somewhat similar 525VA unit to the Belkin one. OPTI says they are the third largest UPS manufacturer in the states so maybe it's them (presumably after APC and perhaps TrippLite?).
I've used the PK Blackout Buster before, and it's rather nice for a basic model. I like the outlet placement in particular since it can accomodate 2 "wall warts" in the 4 battery protected outlets (you have to hang the rear over an edge to allow the second one to protrude downward). For $50, that's a good one, and you can double it by adding a second from what I remember, as is mentioned above.