I've only been queuing arenas on my Warrior this xpac, and 'BiS' is completely comp dependent.
In general the gear you need as an Arms Warrior has the 'of the bear' quality to it (Strength Stamina). Some pieces you use may not have that quality, because the scaling on another item is too good to pass up (Tranquillien Champion's Cloak being a prime example).
Strength stacking isn't nearly as viable as going 'Of the Bear', because that doesn't really fit the new Warrior play style. A Warriors job, atm, is putting out good consistent pressure with Rend, and being a general nuisance, becaus he cannot be damaged down easily through dstance, and any cc on him is futile.
Strength stacking seems good because Warriors scale so well with Attack Power... but the thing is, they also scale with stamina, because they should always be sitting in Dstance. There are a few other reasons Strength stacking isn't very good, but lets keep this short.