http://www.wowhead.com/?talent=bVhbuhhtMhsVckt0xx

I run a very similar build to this with my priest and I have no problem healing groups or soloing (took out Improved Divine Spirit since you did). And if you're just dual boxing with a DK you want to be able to put out a little DPS. This build provides you very good single target heals as well as acceptable DPS.