What I've done is setup a macro for each toon like so :
#showtooltip
/cast [nomod, target=party1] Renew, [target=party1] Power Word:Shield
and just bound that to numpad1-5 in hotkeynet so when i press numpad 1-4 with or without a modifier it heals or casts PW:S on em. Ofcourse you can set up to 4 different spells using that way and macro but i prefer it this way. Only thing you have to remember is which is party member 1-4 as the 5th is a self heal using target=playername. I allways have the same group order which makes it a whole lot easier to remember.