I made my secund wd, just for fun, with waller- pile on build, which is a big fun for me now.
This:
http://www.diabloprogress.com/hero/laposbivaly-2865/Hera/22629563Its a really cheap one, ( ~ 5 mil i spent on it, only my skull grasp was expensive, but 6 cc is extreme, it was a required trade for me ), and it works well up to mpl 3 ( dont try higher yet) .
So i think a high end version of this can rox all on mp10 too... ( the most effective is vs bosses, so it can be a good uberboss killer:) ) .
I dont played too much time it yet, now im in act 3, i done a1-a2 on mp3, act 3 too, till ghom, and no problem, all was fast enough, but advices are welcomed, as i said, i havnt much experience in this kind of WD.