I've been a modder for years, although I don't have a windowed case, because if where it sits, my machine is pretty tweaked inside. My mods are all done to facilitate overclocking and reliability. My full tower Antec case has several extra fans, rounded cables, extra heatsinks, etc... It has sruvived a couple mother board swaps and a new power supply and isn't likely to be outgrown soon. If I get time this weekend, I have to pull it apart and install a USB II card. That'll get hooked up to the 4 port front mounted USB thing mounted in one of my drive bays. I'll then add a couple USB headers in a couple slots on the back of the case to bring my up to a total of 10 USB ports (Scanner, printer, mouse, PDA, Digicam, Joystick, UPS trigger, and a little room to expand).
I also recommend SE (sharkey extreme) for reviews and pricing. crazypc is also cool, but IMHO the best place for ideas is:
www.virtual-hideout.net ,
Most especially their picture galleries, but overall this is the most hardcore site I've found for modding. If that doesn't give you some inspiration, you're hopeless.
For all the parts you need to tweak your box, I think the best selection can be found at:
www.cyberguys.com
I skipped building a fan bus or bay buss and instead got some Fan Mates to allow me to quiet my rig down, but keep the air flowing. Are you considering liquid cooling, or is this a cosmetic project?
jmx