if your going to be building an amd system like that i would recommend 6 case fans, not 2. two front, two back, and the one side and top. really the side and top aren't that important, it's the front and back that are important because they direct airflow over the process which cools it more. obviously you need a CPU fan (it takes about a second or two for an uncooled AMD to reach 600 degrees, saw a cool video on tom's hardware doing that

).
Why are you going with the two hard drives? personally i would go for a single 160GB instead to allow for future growth. but going with serial ATA and seagate sounds good.
Also i would recommend getting a Lite-on or a PLextor CD-RW drive. i've owned both memorex and plextor drives and the memorex has caused me a lot of problems (as i've heard they've done to other peopel). The plextor has been really awesome though, and it's fairly cheap. the lite-on is less than the memorex anyways and a lot of people here swear by them.
I would recommend a more powerful PS too. 350 isn't very much. also make sure to get a good quality one as it can make a huge difference. Also what type of case are you going to get? i would recommend the cheiftec dragon series (or antec or enermax equivalents) cause they are just amazing cases.
I'm not very familiar with the radeon series, but i'm assuming that the prophet is ATI based, right? if so i would definitley go with a 9700 over a 9500.