General Guidelines For Leverage?

[Josh Milewski]

In a recent post I follow I saw someone calculate the leverage percentage of a the deal being discussed which got me thinking. I know of the 1%,2%,3% and 50% rules but I don't think I've seen a general guideline on protecting yourself from over leveraging. Do you have a specific percentage you try to stay under? 

Also it's certainly possible one of the rules I already mentioned is the same thing as leverage percentage and I simply didn't recognize it.