This is a decent budget setup. If you can, you can buy the Phenom II x2 555 for $88 before $5 promo: http://www.newegg.com/Product/Product.aspx?Item=N82E168...
Make sure your motherboard has the option to unlock cores. Mots brands will not hesitate to advertise it in their detailed specs. If it doesn't unlock for you, the PII x255 is still a badass CPU with easy overclocking if you were to change your mind. The Athlon II x3 already has 3 cores guarantee and I know some people have had unlocked to 4 cores for those too. Not completely sure though Either way... you're good to go. You will have enough power from your PSU to power a Radeon HD 6850 if you plan to game. Otherwise you're only using integrated graphics. You won't be doing any decent gaming with that. You can always grab a cheap discrete GPU for now. The 5450 is like only $35.
Ok thanks, really liking that llano build. Also, will it still be able to use that network card that I originally listed.
TP-LINK TL-WN781ND Wireless Adapter IEEE 802.11b/g/n PCI Express Up to 150Mbps Wireless Data Rates 64/128-Bit WEP, WPA, WPA2 http://www.newegg.com/Product/Prod [...] 6833704059
The build would better for the money compared to pre-builts. You get upgradability, the power supply actually is decent, you get a better video card than most pre-builts would already have in it. The only negative is that you would troubleshoot yourself.