Gaming computer for GW2 and BF3

Approximate Purchase Date: Before Aug 20, 2012

Budget Range: 600-700 After Rebates

System Usage from Most to Least Important: Guild Wars 2 (Maxed out), BF3, D3, Skyrim, youtube, basic internet browsing

Parts Not Required: Need it all

Preferred Website(s) for Parts: No Preference as long as it's a reliable source

Country: USA

Parts Preferences: I need something that can be upgraded later. I don't want anything that will limit my ability to improve this computer to keep up with increasing game minimum requirements.

Overclocking: Maybe ( Don't know how to)

SLI or Crossfire: No, I don't even know what it is.

Monitor Resolution: 32inch HDTV, I want to get a 1080 Monitor

I have been having issues creating my own build for the upcoming release of Guild Wars 2 and I was hoping that you guys could help me out. I would loooovee to have GW2 run at maxed settings (I was thinking about i5 2500k and 6870, but I don't know how to work the rest of my build into my budget.) and bf3 ect. on lower settings.