9/10, looks really good. You got hit capped and attained enough spell penetration, split the two shaman caster sets for extra resilience, and got the T6.5 legs. Talents and glyphs are all solid choices, though in higher level arenas I imagine you'll want to replace the glyph of healing stream totem, as all casters should have enough spell penetration at that level to invalidate your glyph.
My one nitpick is your choice to go with six stamina gems. I'm at a loss as to why -- it wasn't for a socket bonus, and even if it had been, I don't think it would have been worth it. Were you looking for some maximization of a stamina/resilience balance of which I'm not aware? I'd say choose resil over stam. That's the one thing that keeps your shaman from being 10/10 in my book, but that's a small detail -- your resto shaman looks top class to me.
Edit: I can't believe I forgot to mention this -- seriously consider getting the Crystal Spire of Karabor for a weapon. The +200 healing may not seem like much, but when you consider the percentage boost that gives to your riptide direct heals and healing surges (and the extra spellpower you would need to get to achieve a similar result), the tradeoff for the minor stats loss on the weapon may intrigue you.