Homebuilt does not mean custom built. Homebuilt means you build it yourself.
You have enough fans. One fan in back and one in front are enough.
And you're getting ripped off. Here's a better build for less (especially with shipping), assuming you build it yourself, which you should.
CPU/Mobo: X4 955 and Gigabyte GA-770TA-UD3
$228 after rebate. Technically the same CPU with a USB 3/SATA III board that more future proof.
RAM: G.Skill Ripjaws 2x2 GB 1600 mhz CAS Latency 7
$115. Faster sticks.
GPU: HD 5770
$150 after rebate. Much, much better GPU.
HDD: Seagate 7200.12 500 GB
$55. Faster HDD.
Case/PSU: Antec 300 Illusion and Earthwatts 650W
$125. Better quality case and a much better PSU.
Optical: Cheap SATA DVD burner
OS: Windows 7 Home 64-bit OEM $105