I really depends on what you use your computer for. If you are keen on doing a lot of multi-tasking and encoding/rendering, then the quad would be the one to go for. I have a quad core because I do a lot of video editing where I need rending to be as quick as it can.
If you don't do much of the above and just want superb performance in games then go for the E8500. One thing that does strike me as odd is that you already have the Q6700. What is your current clock on this? Clock for clock, a new penryn will be quicker, so a Q6700 @ 4GHz is likely to be the same as a Q9450 @ 3.6GHz. One thing to bear in mind is that the Penryn cores do NOT like high voltages (>1.5v) unlike the Q6600/Q6700 series. If I was wanting a new processor, I would just save my cash for a Nehalem in Q4 of this year where a new mobo will be needed as well!
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