Need Help With My First Homebuild

[Saager]

Hello all, I've decided that its time to get a more modern pc to start handling newer games that are coming out (specifically BF3). I'm looking at a desktop because it would be the most cost effective option. However, I am not sure what the best course of action would be because I have never built a pc before; I've replaced RAM and a few small bits but never a whole PC. So anyways, heres the components that I'm looking at thus far, please tell me what you think and offer any advice you see fit.

CPU:

AMD Athlon II X4 645 Quad Core Processor
Manufacturer: AMD
CPU Type: Desktop
Processor Interface: Socket AM3
Processor Class: Athlon II X4
Processor Speed: 3.10GHz
Cores: Quad
L2 Cache: 2 MB
Bus Speed: 2000MHz (4000 MT/s)
Fan: Included
Wattage: 95W
Additional Technologies: MMX, Enhanced 3DNow!, NX bit, AMD64, Cool'n'Quiet, AMD Virtualization
Unlocked Multiplier: No
Instruction Set: SSE
SSE2
SSE3
SSE4a

To be honest, thats about as far as I got and then got rather confused. Mainly I'm shooting for a moderate cost PC that would be up to playing new games coming out. Any suggestions for components?

ETA: I'm looking at about 4G RAM, I have a spare HD as well as keyboard, mouse, and monitor. I may also have a case.

 

[Timop]

Whats your budget? If its low then I would suggest waiting for Llano. But eitherway a Athlon II X4 wont be able to max out BF3 at any decent resolution.

 

[Saager]

I would like to keep it under $800 if possible. And I'm not looking to maxout new games, I'd just like to run them comfortably.

 

[Timop]

$800 without a monitor can buy you a setup MUCH better, however llano is still something to consider for a first build as setup is easier and pretty hard to mess up with.

Heres a ~$800 build
2500K + Gigabyte Z68 $329
http://www.newegg.com/Product/ComboDealDetails.aspx?ItemList=Combo.654386

HD6950 $200AR
http://www.newegg.com/Product/Product.aspx?Item=N82E16814150523&cm_re=HD_6950-_-14-150-523-_-Product

4GB RAM $39.99
http://www.newegg.com/Product/Product.aspx?Item=N82E16820231253

Antec 650W $65
http://www.newegg.com/Product/Product.aspx?Item=N82E16817371044

Samsung F3 1T $50
http://www.newegg.com/Product/Product.aspx?Item=N82E16822152185

LG Burner $20
http://www.newegg.com/Product/Product.aspx?Item=N82E16827136236

Total: $704 + Case (I would recommend a new one if your old one isn't something higher-end)

(If you don't care about OCing save ~$33 with this combo with a 2300 instead of 2500K: http://www.newegg.com/Product/ComboDealDetails.aspx?ItemList=Combo.654392 )