You are using the 1.8ghz 6300 conroe right?
Surprising the only faster C2D you can find is that much more. Which CPU did you find for 100?
Can your motherboards support 45nm C2Ds (wolfdale)? Those CPUs have a huge OC headroom.
I was referring to the Core 2 Quads mentioned about being out of my price range. And yes my motherboard has support for some 45nm CPUs.