I've been experimenting with the talent calculator, largely because I recently got a one-handed weapon that's almost as powerful (well, not quite, but ridiculously close) as my Claymore of the Prophet I have so far been unable to get rid of... that made me curious if a build like this:
The World of Warcraft Armory
Would be viable at all for Arena... the idea is to balance the Arms tree with protection, and fight in Battle Stance with a slow one-hander and a shield. This gives you more survivability, but gives you access to Mortal Strike, etc.
Not sure whether it would be better to just go Prot all the way and just fight in Defensive stance, though... any opinions?