Hammer / Staff guard
for a hammer/staff guardian i would suggest your run a 0/0/6/6/2 build and pick up altruistic healing in valor line and master of consecrations in virtues line. then take out save yourselves and replace with purging flames. you can also switch out 2 handed mastery for empowering might if you have a good crit rate for a little more sustain. however do note that this build is only good for groups of at least 10+ since you want to make sure you have allies around you to fully maximize altruistic healing.
for anything under 10 man you can use the 2/1/6/1/4 meditation build that you posted on your other post.