My New Comp Is Done

well i finaly got it..my new computer. it is extreme.. but now im looking for a game to install on it..hmm.. Anyone got ideas? i like games that are free to go whereever you want like GTA but i love the first person shooters online. and i also like being able to do w.e i want like any quests. any ideas? also hoping it its a clan game..so give me ideas