Is more sp dmg worth it?

http://www.wowarmory.com/character-sheet.xml?r=Maelstrom&n=Anithina
This is me, my first question is frankly do i need to toss my badge shield for the one from SSO as i keep getting told? i know i gain some spell power but i lose 22 def gain no stam ext... Wouldn't it work better for me to keep the shield and find SP dmg another way? is there another way?

Also seeing as i need spell dmg the best other place to look is my shoulders right now i have the shoulder guards of the bold and i could use the t4 shoulders(i'd love to get them but sadly the way that instance works i can't pull rank when they drop and there for end up rolling against everyone and his mother to try and get them...my luck seems faulty so far) would it prove fruitful to go to bot and get the righteous shoulder guards as a temp upgrade?

Last question is am i ready over all to tank more than T4 content? i mean MT not OT which i know i can do(i have done hyjal AOE tanking). I'd like to get to tank TK SSC and BT as well and would like confirmation that i'm either there or on the right track.

Imo, no. There are many ways of increasing your threat, and gimping your avoidance shouldn't be one of them. They include:
Wrath of Air Totem
Shadow Priest (If you are overgearing the content, and Misery)
Flask of Blinding Light / Adept's Elixir
Wizard Oil
Destruction Potion
Spell damage trinket for threat-specific fights.

It would prove fruitful to do Botanica for your shoulders, imo, but I've heard some horror stories from other Paladins about their drop rate. Personally, I see them all the time. Anyway, though, they're not too badly itemized, and although T4 are an upgrade, you can skip to the Pauldrons of Stone Resolve (first timed event in ZA) relatively easily. I did.

Aside from some of your weak enchants (9 Stam to Bracer? 10 Stam to Boots? 10 Stam to Chest?), you seem fine. I don't know why you bought the warrior legs from the badge vendor, though. It's not a total loss, as we make use of expertise for single targets, too, but if it was a recent purchase, I'd consider paging a GM for your badges back to get Inscribed Legplates (compare to T6 Legs).
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Stormreaver US

Modus | Governor

Spell dmg gets more and more important further on when your mage, lock and other DPS classes starts doing crazy dmg. The more you have, the easier it will be to keep the aggro and faster the boss will die because your DPS will be able to kill faster.

On some bosses, you need to have high threath to regain aggro quickly after phase changes (Hydross, Leotheras), if you are the MT that is.

For the raids, I always use the Superior Wizard oil, it helps a lot. As for the flask, I use a lot the flask of blinding light for Hyjal SSC and TK.

So to answer your question about the shoulders, YES go get the righteous, they are very good until u can get your hand on the T4 on HKM.

IMO, if you still have blues, forget MTing above Gruul/Mag. Don't skip the progression. Get the stuff u need in Gruul and Mag before going into SSC and TK. Get the stuff you need in ZA, SSC and TK before Hyjal and BT ESPECIALLY if you wanna be a Main Tank. Don't forget that 24 other people are counting on you to do the job.
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SSC: 5/6 TK 3/4 HS 4/5

i got them because at the time i was at 489 def rating over all and needed the extra rating despite being uncritable(i had like 12 resil to make up for the 1 def rating) i hate resil and wanted to phase it out of my gear...though looking at them both i don't know how i missed the ones with more dodge. Somehow i skipped over them and frankly i prefer dodge over everything else but anyway...As far as blues my shoulders are the only thing i still have thats blue. And being on a RPPVP server(gimped raid progression sadly) means that getting raids together outside of guild is nearly impossible and geting raids for more than kara in this guild is impossible as well. Either way though i can OT hyjal relatively well but i really want to push past being an OT i enjoy being the MT and do so in everything Mag's and lower(save once when a druid raid leader said he could MT mag and i just had to watch him go boom rather loudly).

defense rating to chest and cloak would pretty much take care of your defense woes.

Good luck with your progression. Sometimes if you really want to MT things, the only way to go about it is to start your own guild and drag people along behind you. :]
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