For my pally I use a really simple "/click".

The master macro has:

/stopmacro [mod]
/startattack
/Click (Where I put my 96969 macro)

96969 Macro.
Uses 254 of the available 255 characters.

The sole use of "click" here, is extra characters.
No point in wasting mana, for a mob which will die long before it closes to melee.
And I'd like to start attacking immediately, if I press the "click" without a mod key.