One thing that I would recommend is to go through the SMNet resume browser not from the perspective of a stage manager, but wearing a hiring hat. Look at all of them as if everyone was applying to work for *you*. Who would you choose, and what would make you choose them? What situations would make you choose one over the other, and how did the formatting affect that choice?
I think you'll find that content prevails over format in nearly all situations.
I spent quite a bit of time working for a recruiter. I saw hundreds and hundreds of resumes and spent lots of time rewriting resumes to promote our chosen candidates. I'd agree with the points of whitespace and simplicity. I'd also encourage you to remember that this is a sales document. It's your audition. The interview is the callback. Your resume is an expression of your style as a stage manager. If you bring tons of experience to the table, then devote the bulk of your page to listing the shows. If your strength is in the diversity of the technical positions you've held, then focus on that. If soft skills are your forte, then dwell more on the special skills are or on references. If you've only done a few shows but you're a killer swiss army knife SM, then just list those shows with subdetails of all the various things you did underneath. Don't forget the functional resume format, too. It skips chronological order in favor of listing just the special skills that you've accumulated over the course of your career.