Priest Build Help

So i am dual boxing my priest and DK. I have the priest build as a shadow priest right now, but i don't do any shadow spells, mind flay is good but it breaks follow and it is a channel spell. Mind blast is good but it has a cool down, and i don't like throwing up dots. I just keep on using smite with my priest, which is a holy spell and breaks Shadowform. Basically the reason i spam smite is cause i find it hard, for me, to box with a DK. Just hitting 1 button, that is a cast without a cd, is what i want to do with the ocasual greater heal to top my dk off so i have no down time. So sense i am not using and shadow spells my spec is useless. So i was thinking about respecing to holly or discipline. I looked on wowwiki for a build and didn't see any that i liked. So i came up with something like this:

My build (EDITED)

What my end goal is to be healer for heroics and raids (10/25). I will probably swap out one of my shams for her cause it will add some nice buffs that will increase there spell power. Also will buff the tank health.

Here is some reasons why i didn't go with somethings:
- Didn't take healing focus cause being healer i shouldn't be taking damage
- Didn't take Desperate Prayer cause again shouldn't be taking damage
- Took Spell Warding, though i shouldn't be taking damage, mob have some aoe spells
- Didn't take lightwell cause i don't think it will help much during a fight
- Serendipity i think will be a really good raid skill cause if 2 people are on tank to heal (1 being one) chances are that i will over heal... plus boxing there is a good chance spamming my heals will over heal
- Circle of Healing, think will be good for raid and aoe damage recovery
- Think that divine spirit and imporved divine spirit is a must for priest, will increase spell power by 80
- Enlightenment i think is good cause it increases spirit and with Spiritual Guidance is good

Let me know what you guys think about this. Cause like i say, i wasted 51 points in shadow which i don't even use. With this build i will increase my spellpower probably by a lot, which will increase the only skill that i use, smite, and i will be able to heal my DK better fighting elites.

EDIT:
Took out imporved divine spirit cause it will not stack with flametogue totem and wrath totem... so it is a waste.