i prefer a small shackle with a bushing that the heim mounts to the top of. i've never liked the idea of running the shackle with the heim on the bottom, it just doesn't make sense to me.
you can also build a slip n' twist setup. they're a lot easier to mount and seem to work well if you keep them greased. google it and you'll see a bunch of write-ups, mainly toyota guys.