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From what I have read Disc is a better MT healer. Yet I am always asked to MT heal as Holy. Would I see a big difference healing MT as disc?
Yes, definitely. Holy tank healing isn't even considered 'viable' anymore by the geeks at ElitistJerks. My sticky's actually a little bit outdated on this subject; technically, disc is a complete niche spec. What disc does best is actually fairly unknown, we tend to drift around in raids performing unspoken tasks that help the raid as a whole in some obscure way, but we are effective at our job nevertheless. Disc's rough single-target HPS throughput numbers don't even come near those of a paladin, and as of such a disc priest will not be solo MT-healing Ulduar hardmode encounters. That said, disc *does* do a far better job at tank healing than holy and you should be able to MT-heal every non-hardmode encounter up to Yogg-saron with it (even though some fights like Vezax may be painstakingly hard, especially so with a [slightly] undergeared tank).
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I raid heal with ease as well, and from what I have read Disc is better now at raid healing than it use to be, Though I know that Holy is much better at it.
It depends. Even being disc/holy dual specced I often have a tough time choosing what spec to go for what boss, and the only reason I go disc 90% of the time is because I'm geared more for disc than for holy. Holy is better in raid-healing throughput (healing everybody in the raid up really quick) while disc is better at preventing damage by basically shielding the entire raid, and throwing a Penance where needed. Like I mentioned earlier, disc priest perform a fairly unknown niche role that no other class or spec can perform and which hasn't ever been seen in WoW before WOTLK.
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First off I have around 2600+ SP buffed in 25 mans, with Disc I would have a lot less. Would the drop in SP hurt me healing as Disc?
Not really. I notice the difference in spellpower on my stats tab when I switch between the two specs, but I never really notice it when doing actual healing. I just take higher amounts of spellpower as one of the 'mostly invisible perks' that come with being holy. Both disc and holy have such perks.
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Am I geared good enough to try Disc?
Oh, yes. Disc isn't a spec that requires awesome gearing to work. On the other hand, your mana, intellect and spirit do seem kind of low to me; you certainly wouldn't be able to handle content as disc you cannot handle as holy in the first place.
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The reason that I stay /Shadow is that at times the raids I am in need more DPS or someone to MC targets and I use shadow for this.
DPS is a valid reason, though you do not need to be shadow spec to do the MC'ing on Razuvious, really. It just helps because there's less chance you'll fail, but you can easily do it as any spec, or even specless. In the worst case you get a lot of misses and 3 or 4 people die.
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Thank you for any advice you have in advance.
And you're welcome =)