All those power supplies are bad. Try this one. http://www.newegg.com/Product/Product.aspx?Item=N82E168...
Your budget is way to small with software the cheapest I have been able to build one for is $380 after rebates a $50 GPU and only an Athlon ll X3. Another has been a $420 one that is better but lacks a GPU at first then later got a 560Ti.
CORSAIR Vengeance 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model CMZ8GX3M2A1600C9B
I do think that a budget of 300-400 is a bit unrealistic and I don't see you being able to get it for that price , the price for what's listed here is 675.93 Canadian and there are a few rebates to be had but not enough to bring it down much. The sound and network chips are intergrated.
That same exact coolmax V-500 was on sale locally. So some bought this ps.
Ok i was surprised. AthlonIIemail@example.com, hd-4870 1gb card at stock clocks, the system passed prime95+furmark testing with no errors.
It has two 12volt rails, 18 amps and 16 amps, you must use both rails to power the card. The hd-4870 has two pcie power plugs on it. Some cards only have one pcie power connector, it might not work on those cards.
On another system a 939-4200+/hd-4870 512mb passed testing with a second coolmax V-500.
On both coolmax's i had to void the warranty, peel the sticker from the fan, take the rubber plug out, and put a couple of drops of synthetic motor oil in the fan bearing because the fan bearing was dry and noisy.
If you want to avoid that kind of headache, stick with corsair, antec, seasonic, ocz, silverstone.
A corsair 430 has a 28 amp 12volt rail that is more reliable than the coolmax's oddball 16amp and 18 amp rails.
You might want to consider the A6-3670K it is a quad core that overclocks fairly well and has a 320 shader gpu for now. later on when you have more money you can upgrade the video card.