BakaShinobi wrote:
To be entirely honest Disc has more overlap with shadow than holy due to less focus on mana regen and more on stats that they both favor. I currently run ToC 25 Main Shadow and Off Disc and use almost the same gear (I have a few pieces to switch out). I can say I heal passably/well in my shadow gear, but would benefit (obviously) from a few more pieces for pure healing gear (so that I didn't have hit on my healing gear). Higher levels of raiding, (when pieces give more hit per, making it so that you need fewer hit pieces) the overlap becomes more apparent.
So if you want to try and focus mostly on just 1 set, Disc/Shadow probably requires fewer pieces than Holy/Shadow.
Though it's good to note that being disc makes you a better tank healer while being Holy makes you a better raid healer. It's not to say that one can't do the other, just that they are specialized differently.
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I have found this to be true as well. I have done a reasonable amount of low end raiding (Naxx 10/25, VOA, Sarth 10/25) with Disc spec and geared up as Disc. When I decided to dual spec shadow as well I have been able to assemble a decent amount of gear through rep rewards and crafted gear. I swap out my Disc staff for a rep reward Dagger (Kirin Tor rep) and badge reward offhand, my robe for a crafted ebonweave one, my gloves for a shadow set I picked up on a raid that no one wanted and my helm for a crafted one. With the right gems and enchants on these items I can get hit capped and I am geared enough to run Heroics and lower end raids as shadow. There is also a nice rep reward belt you can get from Wyrmwrest which I used to use before I got my gloves. Although I do run with icewalker on my boots which gives hit and crit as although the hit is essentially useless for disc the crit is nice still.