I have used all of them, and the best one in my opinion if you want a all in one system is
Vudo. It is basically healbot, with its built in grid / clique. The big advantages are that you have your own window for all the tanks apart from the raid, so you always know whats going on with them.
Its very easy and very customizable to your needs, and takes a very short time to load it and get it ready. The biggest perk to Vudo is when your in a raid, and lets say you are on Lord Marrowgar, when he does bone spikes on peeps, a little picture will pop out of those peoples unit frame and stay there , so you will always know who has them,, it does that for every boss.. and their main abilities against the raid..
like i said before, i have used all the other ones, and this again in my opinion is the easiest, and most helpful healing mod out there..