It might be a tossup. You can overclock the Q6600 to around 3Ghz and it will eat the 8500 for breakfast esp with 4 cores and it would give you more for your money.
About the specs, 8500 has sse4 so if you're encoding with HD codecs, it will be better for that. IMO stick with the quad core because even at stock if a program can utilize quad core will beat the 8500.
About the specs, 8500 has sse4 so if you're encoding with HD codecs, it will be better for that. IMO stick with the quad core because even at stock if a program can utilize quad core will beat the 8500.