[Cas Beep Beep Im A Jeep]

Hey guys, since I can't stand my laptop anymore, I would like to build myself a PC in late november/early December. But since I don't know anything in computers, I need help. I am going to get help from certain people but I would also like to get help from you, the community.
I might be wrong, but I've seen a lot of people that built their PC on this site ( http://www.newegg.ca/ ), so if they deliver to Canada, ( Quebec, precisely ) and are trust worthy, I am willing to build it from this site,

1. my MAX cap is 750$ Canadian money, but would prefer to spend 600-700$
2. I need EVERYTHING beside a monitor ( screen ), I might have one, if not i'll just buy one at a store nearby.
3. I just want to use my PC to game & Multi-task ( internet ).Not looking forward to get a MASTER computer and get the best one, just want a computer that can hold battlefield 3 on atleast medium settings and listening to music at same time. Games I would like to play : Css, Cs:GO, Minecraft, And if possible, Battlefield 3 ( I know i can't get ultra settings with a budget of 700$, I just want to PLAY it, don't care if I play it at medium settings, as long as I can have fun playing it ) and maybe some upcoming games like GTA 5.
So yeah post the build you think is the best for me, I'm gonna pick the best one in November or December