@Albert Bui
Powerful stuff there sir... thank you! You hit several key things that are important to me. DTI is something that I hadn't thought about. Being that I'm trying to break into building my business credit so that I can have not only HELOCs, but lines of credit in general, I would like to come to the table having as little debt as possible against my business. However, I know that using a HELOC as a credit line is also important. Maybe even more important because that's a way to build the credit up in the first place. That may main reason to go with a HELOC if I can get one with my rental property over using my 401K in my situation all things considered.
Which brings us to the idea of "both". I might just do that. Use the HELOC as a means to assist building business credit, while combining funds from my 401K to keep my DTI low and insure that my HELOC does not exceed 30% of my limit to keep my score optimal.