Best 7 Games Like World of Warcraft - PC Game Haven.
Ultima online, SWG and EVE are all highly concentrated on PvP. Other than that, WoW or SWTOR would be a safe choice and they are newer. For potentially future games, I hear Crowfall and Camelot Unchained will have a strong PvP player base. Again, WoW has both a new expansion coming out in August and a classic server being released (unknown date).