$500 Budget Gaming Rig

At this time, I only have around $500 to spend. That may change depending on if some items I have on eBay sell. On the high end I may have around $700 to spend.

The PC I currently have is ridiculously old (8 years). I'm barely running games like Team Fortress 2 with a 2 GHz Pentium 4, 512 MB Ram, and Radeon 9600. I tried running Starcraft II and no joke, it took about 30 mins to load. The MOBO is so old that it doesn't even have any PCI-E slots. So, pretty much anything will be better than what I have now.

This will be my first build ever, and I'm very excited to finally be able to blame my sucking at TF2 at myself, instead of my PC.

System Usage from Most to Least Important: Gaming, but it doesn't have to be on the highest settings.

Approximate Purchase Date: Within a month

Budget Range: $500 - possibly $700

Parts Not Required: keyboard, mouse, monitor, speakers, OS

Preferred Website(s) for Parts: newegg.com

Country of Origin: USA

Parts Preferences: None

Overclocking: Yes

SLI or Crossfire: Yes, I wouldn't use it initially, but I would like to be able to upgrade later

Monitor Resolution: Dell 2405FPW (highest resolution is 1920 x 1200) & Dell 171EFPB (highest resolution is 1280 x 1024, also I think it's VGA only)

Additional Comments: I am willing to wait for any possible Black Friday sales. Most of the budget gaming PCs I've seen on these forums tend to be around $1000, but I'm willing to use older tech as long as I have the possibility of upgrading later. I would like to use this with both monitors. The games that I'm planning on playing include TF2, L4D2, and SC2.