I am was just looking around in the AMD section of the forums and found that there are lots of posts towards "help with budget builds under $500". Since i just build one for my friend i decided to share with you guys and answer any questions. I am currently installing the win7 updates but feel free to ask me anything. I can also do stress tests and temp tests if requested.
IMO i think the 3850 is more of a bang for you buck then then 3870. Performance wise you won't feel a difference between the two, but if you plan on OC then go with the 3870.
Also on that note the stock fan is more then enough (if not oc) i am getting temps at 20 degrees idle, i didn't bother stressing it since my friend only need it for the internet.
500GB Barracuda 7200rpm SATA III w/ 16MB Cache 79.99
A8-3850 APU 2.9GHz w/ 4MB Cache 119.99
F1A75-M PRO w/ Dual DDR3 1866, 7.1 Audio, Gigabit Lan, PCI-E, CrossFireX 109.99
SH-S243D 24x DVD-Writer, SATA, Black 17.99
HyperX Genesis 8GB DDR3-1600MHz CL9 Dual Channel Kit (2 x 4GB) w/ Intel XMP 39.99
Builder Series CX430 V2 Power Supply 49.99
One Hundred Case 49.99