I usually go with a Repeater Region.
And then pick the six heals that are most useful for me (Alt Left/Right, Ctrl Left/Right, Shift Left/Right clicks).

I also have buttons for some spells, but those are either target independent, hit the whole group or are a cooldown ability.

I usually have two assist heal macros for each team; something like:
#show Renew
<Insert Assist>
/cast [help][help,@targettarget][help,@targettargettarget] Renew