well...FSB will give you your speed depending on the multiplier. So 3.6 is 3.6 which is still slower than 3.7 regardless of FSB speed. I would rather have a 1650 FSB running my CPU at 3.7 than a possibly taxing 1800 FSB at a slower speed.
no the q6600 has a multi of 9, so i lowerd it t o8 and gave it a 450fsb instead of 400 at 9, or 415, at 3.7, but my responsiveness in windows seems to be much better with a fsb at 1800mhz then it did at 3.7 and 1650mhz.
go with the higher fsb... a q6700 at 2.6ghz and a q6600 running at 2.6 ghz.... the q6600 is gonna run faster because the fsb is pumpin faster... i too have learned high fsb feels more responsive.. thoguh i don't know if i'd be able to tell that small of a difference apart