Reroll questionFollow

So I hit 70 with my lock and am enjoying pvp and end game things, still I need to roll another class just to keep things fun and interesting. Here in lies my problem.

I have tried just about every class and nothing seems to come close to lock for me. Just a note, I have played almost every class to 20 or higher. Can anyone suggest a class I should make myself level to 70. I want this class to be very good at pvp and arena. This will be my main focus with some slight raiding here and there.