This is the build I use for farming, bounties, GR 70 speeds, etc. Very relaxed gameplay and not dependant on CDR of any kind. I highly recommend it. Edit - Sages builds for the necro are generally going to be slower and ultimately less effective at farming DB's.
Any other build will require you to drop a meaningful 6 piece bonus since all necro sets have the default 6 armor slots. Next patch, the 6 piece Pestilence set is getting buffed so it might actually be better to run T13 without Sage's as opposed to T10 or so with this Sage's build. But if you really want to run Sage's, this is your only option.
@Everyone: Please read the thread, he's asking for Sage's build particular, so full 6 piece builds and LoN builds don't really make sense as they can't be combined with Sage's.