Hmmm....
Okay, you will more than likely mount the front fans to the inside of the frame.....they will then be sucking air in through the grid in front of the case, which is covered by the front plastic parts except for some air inlets...at the back you would put another fan blowing out. Fans screw on to the case, they should come with the proper screws (the screws will go from outside in, in other words hold the fan in the proper place and put the screws through to meet it. Might be a good idea to have someone help

)
You might want to upgrade the power supply unit....here's a link to the Antec Truepower 330 and the corresponding review on Anandtech....also the True 380 might be more up your alley as you've got an A64, the Radeon, and some big drives and you're gonna have a lot more fans soon
http://www.newegg.com/app/ViewProdu...-103-906&catalog=58&manufactory=BROWSE&depa=1
http://www.anandtech.com/showdoc.html?i=1841&p=5
Right now the 330 watt unit is $44 on Newegg, while the 380 is $60....but the 380 might be better for any future expansion and peace of mind. For that matter the 430 is only $66, +50 watts might not be worth $16, but I'd bet +100 is worth $22. Another point to consider is that you want to have some power in reserve, i.e. not running your PSU at full bore all the time, just to keep up. The Antec line also comes with fan-only connectors that are regulated on the PSU temp.
Found a fairly decent-looking case with some decent cooling options also. Beige coloring, so your drives should *probably* look Ok in it.
http://www.newegg.com/app/ViewProductDesc.asp?description=11-150-017&catalog=7&depa=1
Room for a front fan (intake) and it comes with a topmounted blow hole fan, and a side fan (which appears to be mounted for exhaust, I'd flip it for intake). Also room for two rear exhaust fans and it's only $25.
Personally, I'd recommend getting the PSU replaced first, mount your case fans and see what happens. Good luck, have someone come over to help (give them some :beer: ) and report back.