Alright I found an old post explaining that the Pitbull basically has a beefier crossbar, slightly better security rating.

Nashbar has a Brute mini for a pretty attractive $30, though it seems to be the previous generation. I guess I'm willing to put up with a little extra weight for what seems to be quite a lot more lock for the money. Are there any caveats with that design that would deter me from using it rather than the new one?

Thanks!