This was built with a budget of less than $380. I managed to do fairly well and got some excellent deals. It runs quite nicely, although it certainly has room for future improvements.
I added a small fan of my own to the back of the case, which increased the noise level because the fan was more than five years old. I also added a Wireless PCI card that I already owned.
One thing to note: the 12V (4-pin) cable is almost too short for the motherboard; it's very tight and actually goes under the graphics card. I would recommend adding an extension for about $5 extra.