Need help building a stable gaming pc

Approximate Purchase Date: When ever i get all the parts together

Budget Range: $600- $650, 650 max

System Usage from Most to Least Important: playing games, music, surfing the web

Are you buying a monitor: No



Parts to Upgrade: basically i need everything to build the computer, i want at least 6-8 gig of ram and 500gb hdd, and a good case too.

Do you need to buy OS: Yes, window 7 basic


Preferred Website(s) for Parts: New egg

Location: Tx, port arthur

Parts Preferences: Intel, and western digital for hdd

Overclocking: no

SLI or Crossfire: no

Your Monitor Resolution: 1680x1050

Additional Comments: I am looking for just a good gaming build that will last me for a while, i am just going to play games, listen to music, and surf the web. I would like a good graphic card that i can play League of Legend, Counter Strike, Maplestory with a good fps and no lag.

And Most Importantly, Why Are You Upgrading: I just need a new computer, my old one is not supporting the games i can play.