Q u o t e:
Please look at my disc tree build and let me know what you think. The points in the holy tree are there to get the faster cast time and addition damage for the holy fire and smite which will end exactly at 80. So i just need advice on how I arranged the disc tree with that specific amount of points already there. Are they really working for me or not.
I'd suggest perusing the Armory a bit and looking at what a lot of disc priests are running with and then think about what you want to get out of your spec. If you're looking to PvP your spec may be slightly different than if you only want to PvE. I agree that you should have Meditation for regen though. (As a suggestion that is. ;) )
Also consider this, do you really need Divine Fury or improved Renew? I generally have focused on damage mitigation, crit chance, and mana regen on my own Disc priest .
You might also consider Desperate Prayer, Spell Warding, and Inspiration as far as the Holy end of the spec goes.
Keep in mind, that these are just suggestions and you may have different goals that will change what you choose to spec into.