Flesseck

Elemental Warding is really nice. In terms of those talents you listed, I would take several actions with the following talents:

A) Imp. Chain Heal - I would most likely get rid of this. This is rarely used in arenas, and you should definitely free up two points.

B) Ancestral Healing - If your talent points permit, I would at least place one point in for dispelling purposes and because it's actually a decent buff. Granted it's only 8% of your armor for one point placed in the talent, this can be useful if someone on your team is taking heavy melee heat.

C) Tidal Mastery - This is more of personal preference. If you love crit, go for it. If you're trying to grab Elemental Warding, I'd put the least amount I could considering crit is useful but not as useful to a Shaman.

D) Healing Way - This can be treated the same as Ancestral Healing. I rarely use Healing Wave in battles unless I can anticipate its use in battle by effectively timing it. Putting a point in it isn't a bad idea for dispelling purposes.

Overall, I rate Ancestral Healing and Tidal Mastery above the other talents listed if you were to choose.

Unfortunately, there is some limitations with Elemental Warding considering it only affects Frost, Fire, and Nature spells. Therefore, this would be a good talent against Frost Mages and Elemental Shamans for obvious reasons. In a smaller arena setup such as 2v2 and 3v3, I wouldn't doubt the usefulness of the talent. But then again, you don't see many Frost Mages and Elemental Shamans at the top of the 2v2 bracket. They do fairly better at 3v3 for sure, though.

Personally, I haven't had a real use for it since I really like a lot of the talents in the Resto tree, and I've been happy with my 0/7/54 build. I mostly do 5v5 arena and 3v3 as well. I also rarely am the focus target considering there is a Frost Mage in my 5's lineup, and 90% of the time he is the target.

I hope that helped.