The best anchor I have found for use in drywall is what has come to be known as a zip-toggle or Snaptoggle. They are easy to use, are rated to hold up a lot of weight, and best of all, once installed, the metal anchor is held firmly to the back side of the drywall and you can take the screw in and out as many times as you please. http://www.toggler.com/products/snaptoggle/overview.php
The issue of poor-quality drywall may call for other measures. you will need a foot on the mount rod that is of sufficient size to adequately spread the load and keep it from indenting the surface. If you have a spare piece of the drywall, you could use to set up a test wall where you could try out ideas before actual installation. This would give you very real information that would make your installation go much more quickly. Making full sized paper templates of the objects and the post locations can also save a lot of grief at install.
Please let me know if you have other questions and we can try to find some answers for you.
Jamie Hascall Craftsman, Trainer, Consultant Mountmakingfocus.com jamie@mountmakingfocus.com Seattle, WA 206-954-4141
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