you are thinking about this sport all wrong IMO. If you are in this for the long haul it should really just be about beating your past numbers in a meet. trust me, that's enough to worry about. besides, every meet is different. i've been to small meets with a bunch of really strong guys and then gone to huge meets where i didn't see but a few exceptional lifts. when i compete i don't even pay attention to what the othere competitors are doing. i might watch a lift here and there but i spend most of my time getting my guys ready for their lifts and mine.
also, now there are so many damn divisions in powerlifting that most of the time you might be the only one in your division... at the most you might have three unless it's a World or National comp.
So to answer you, if you enter and don't bomb out, you have a good chance of placing in the top three in most comps with pretty much any numbers.