grid is a great addon, I use to to Heal with Mouseover macro's to great effect, if you are a Healing clicker grid + Clique is good aswell.
that is a link to the TS grid tutorial will help you get it set up properly.
Incase your wondering the way to write a mouseover macro is
/cast [target=mouseover] <Spell>
Where are <Spell> Is the name of the spell you wish to cast. I find this very effective
However you may Consider just having two set of raid frames, For Example Healbot and Xperl, So you can maintain your current settings and still select people when you need to.