It appears to me that the point is being missed. The original poster says he wants a "clunker" (later amended to a "beater" so as not to offend). He already has an NID (a nice gun), so why point him toward a Fox, Smith or Parker, which would be on par with the gun he already has (or possibly better as they go up in grade)?
That Hunter Arms, a Western Arms, or a Nitro Special would seem to be the obvious choices in a "step-down" American double. Or my personal favorite, a nice old Stevens 5100.
Because he ASKED specifically about Foxes, and their virtues. That's why. There ARE beat-up Sterlingworths around, ya' know.
SRH