Not being in your position and not being on any kind of admission committee, I'm hardly an expert but I would go ahead and contact the school, especially if you have other offers. Maybe something like "I've been offered a slot at school XYZ, but you're my first choice. I was wondering if the wait list is ranked and where I am on it while I try to make decisions about grad schools"
Of course, this could be a really bad idea too, but it is what I would try. Good luck!