Well if your a little bored with KO like I am, why not give a new free2play game a try.
League of Legends:
This game is similar to Warcraft 3: DotA, but in my humble opinion MUCH MUCH better.
The game evolves lots of teamwork, it also has RPG elements. You start a game with a Champion and fight other enemy champions in a 5v5 fight. During the game u level up your champion and buy items from the gold u received from killing monsters and/or killing player. Like KO it has a pay feature if u'd like to buy more diverse champions and skins, but if u play enough anyways u can unlock them yourself.
If you do end up playing it, and got more questions about it ingame, go ahead and give me a friend invite "CooLTanG" is my Summoner's nickname.