I recently purchased a 500 f/4L IS USM version 1. And my only two options are to use it hand held or to use in on my Manfroto monopod. But I'm looking to get a good Wimberly like system. With a full swiveling head (up, down and side to side) that can support the weight. The purchase of the lens itself dried up my budget though. So I'm trying to find some low cost recommendations for the time being that would offer similar functionality.