Do you want a PvP spec or a DPS spec? If you aren't a tank I would highly recommend dual speccing.
Personally I found that its hard to get a good arms spec for both PvE and PvP as its hard to get points in survival talents and imporved slam, which is, if I'm not mistaken, a key point in getting the synergy of the build down.
Just looking at your armory briefly I see that your hit rating is insanely high. (18% + precision) I think your DPS would be greatly improved if you gemmed all strength (or armor pen if you go arms.)