Advice on gaming build

Hey I was wanting some advice on this prebuilt cyber power pc:
Approximate Purchase Date: next week
Budget Range: 500-650
System Usage from Most to Least Important: gaming, internet, movies
Parts Not Required: OS
Preferred Website(s) for Parts: i like newegg, but I will use other places.
Country of Origin: US.
Parts Preferences: don't really care, I do like having usb 3.0 included though
Overclocking: maybe, if it's really easy
SLI or Crossfire: no

Cyber build system:
CPU: AMD Phenom™II X4 925 Quad-Core CPU w/ HyperTransport Technology [+20]
Cooling Fan: * Thermaltake V1 Gaming CPU Cooling Fan (Excellent Overclocking + Silent Proof + Smart CPU & System Thermal Monitor) [+13]
Motherboard: ASUS M4A77T/USB3 AMD 770 Chipset Hardware Core Unlocker DDR3 Socket AM3 ATX w/ 7.1 HD Audio, GbLAN, USB 3.0, SATA-II, RAID, 1 Gen2 PCIe, 2 PCIe X1, & 3 PCI
Memory: 4GB (2GBx2) DDR3/1600MHz Dual Channel Memory Module (Corsair or Major Brand)
Video Card: ATI Radeon HD 5670 1GB GDDR5 16X PCIe Video Card [+43] (Major Brand Powered by ATI)
Multiple Video Card Settings: Non-SLI/Non-CrossFireX Mode Supports Multiple Monitors
Power Supply Upgrade: 500 Watts - Standard Case Power Supply [+22]
Hard Drive: 1TB SATA-II 3.0Gb/s 16MB Cache 7200RPM HDD [+22] (Single Hard Drive)
Optical Drive: 24X Double Layer Dual Format DVD+-R/+-RW + CD-R/RW Drive (BEIGE COLOR)
Sound: HIGH DEFINITION ON-BOARD 7.1 AUDIO
Speakers: 600Watts PMPO Subwoofer Stereo Speakers
Network: Onboard Gigabit LAN Network
Keyboard: Xtreme Gear (Black Color) Multimedia/Internet USB Keyboard
Mouse: XtremeGear Optical USB 3 Buttons Gaming Mouse
Wireless 802.11B/G Network Card: None
External Wireless Network Card: None
Wireless 802.11 B/G/N Access Point: None
USB Port: Built-in USB 2.0 Ports
Price:$671

I can get windows 7 for free so I'm not worried about an OS. I was also planning on picking up this lcd monitor from newegg: http://www.newegg.com/Product/Product.aspx?Item=N82E168....

So how does the cpu compare with core i3/i5's. It seems to be better than i3's and comparable to i5's, but i'm not sure.

I want to do some basic gaming on it, maybe play black ops on it. Price wise this is a little expensive, I would prefer something around $600 but I'm not too picky.

I would put this in the cyber power forum, but I really don't care where I get a pc from. Is cyberpower a poor builder?

Also, would I save money building this myself? I've been told that I would not save a lot, and I am wanting to purchase a computer soon, but it might be fun building one myself.

Any recommendations?