http://wow.allakhazam.com/db/class.html?wclass=8;mid=119428077921145385#m1194291037176372998
I wrote that up awhile ago, but still use the same basic set-up. You also might want to check out
Grid instead of XPerl.
VisualHeal is also REALLY good in a raid; the catch is that all healers need it in order to work. It'll show a bar of who you're healing and estimated incoming heals on the target.