I think Artie could take out Benny. Artie (i think) is had it with Tony and the wise guy thing. After Tony burned down the old Vesuvio, Artie never really got revenge. Maybee he is getting filled with rage inside, and simply had enough. Tony and Artie has always been friends, but still Tony has disrespected him, troughout time. You see it in season 6, when Artie attacks Benny. He simply had it, and now he cant controll he´s rage no more... Just a personal theory..