The hot zones have changed since the last post and if your looking to solo with your zerker around 50 I would stay away from the current hot zones. CoM is great exp I think around 51 everything is blue but you can run through them without a prob so makes great exp. OS is still one of the best exp zones in the game, underplayed when not a hot zone so should be easy to do what ever you want there. You do have to watch out for debuffs though, shamans are real bad about it. At 50 it might be close for you, I would suggest zoning in and tring the first 2 at zone in and see how close the fight is, then try and figure if you can do it without V on. Remember that until you break where your going to camp count on getting 2+ mobs per pull. CDonk is a terrable zone to solo in!!!! Rabies is a killer for you if your looking to solo.
My option is that you need to stay in old world zones to lvl up. B/c of our ac we can not take to much damage, your goal while soloing is o try to kill a mob as fast as you can with out taking much damage if you hope for any success. That being said stay in old world.