Well, 1 month is a long time to not check your oil level if you had the oil burning problem that a lot of VXes have. After you blew the engine, did a bunch of oil spew out from the bottom (did the rod blow a hole underneath) or can you still check the oil now and see what registers on the dip stick?
I only ask these questions because I find it hard to believe that a blown engine will occur without some sort of preexisting condition, such as burning oil.
I blew the engine on my 2000 Xterra. It was 100% due to my neglect. I literally didn't check the oil for way to long and had the exact experience you mentioned, rod knock, then break down (except I was like 600 miles from home).
Bart