|For a self-proclaimed "guru", you sure don't seem to be very knowledgable about temps & cooling.|
Your CPU temps are excellent, especially for a Prescott. If you're using software for your temp readings, make sure they agree with the BIOS temps. And you don't have to worry about frying your CPU...it's impossible to overheat a P4 to death. You can kill it by overvolting, but not overheating.
As for the case cooling, all you really need is the PSU & a rear exhasut fan. Front intake fans are unnecessary & side intake fans disrupt the desired "front to rear" airflow. A fresh air duct for the HSF generally works well...just don't add a fan to it.
PC airflow and heat – a cooling guide
As for overclocking, I wouldn't expect a heck of a lot, but you *may* get lucky. Make sure to disable speedstep, C1E, all Spread Spectrum options & lock the PCIe at 100MHz. And keep the CPU:DRAM frequency ratio at 3:4. For example, with the CPU is at it's default 200MHz freq (800MHz FSB), the RAM should be at 266MHz (533MHz DDR). If you increase the CPU freq to 225MHz, the RAM should run at 300MHz, and so on.