For Kara as a healer you need +1000 healing, though the closer to +1100 the better. This number is quite easy to attain, however a lot of people do it at the expense of all their other important healing stats. +1000 healing with 8% spell crit = phail.
I recommend running 5 mans and building a healing set. Cloth, mail, leather whatever has +heal, spell crit and mp5. I also recommend having the mats to bridge the gap with enchants and inscriptions.
I know, I know "but bodhi I am going to replace this gear so why should I enchant it???". Why? Because this is when it is most important. When you are undergeared.
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Bode - 100 Holy Paladin - Lightbringer