well i havn't been using anything since the upgrade, no addons currently, so i can't really recommend anything.  from what i hear though, heal bot it good, and i did like smart heal, but havn't tried with the new build.  I had to completly reinstall the game during teh last patch, so i hav't taken teh time to redownload smartheal.  i recommend gettign as good as you can with out add-ons, (anticipating heals, mana needed, and who is an agro magnet) and then once you have it good, use an add-on to simply polish your already good skills.  all an add-on did for me was pick the level of heal to cast to keep from overhealing.  but as i said before, i don't think overhealing is a problem, as long as you have mana at the end of a fight, and you are not slowing down the run by having to drink constantly.  others will be more concerned with overhealing, saying that means you are also generating extra agro, and such, but with a good tank, running with mages, and warlocs, you don't have to worry too much.