Share '1x9 (or 1x8, 1x10) setup'

I've got a bike I'm going to convert to a 1x9 setup. I've got a few options with parts laying around - third eye chain watcher, a n-gear jump stop (have had great success with this), and single or double chainguards. I'm curious if someone has tried several approaches and settled on one (either double guards, or just one and a device). Or, even done without with high chain tension? Any problems…