I've been real pleased with both. E8200 which is now in my wife's rig. I got the E8400 on the basis of the E8200. The E8500 I sold as it really didn't add that muchh for the extra £. I'd be inclined to go for the E8400. Compared to your Q9450 , your E8400 will give you he ability to go >4k. It will also go well if you move onto DDR3 , where the ability to hit high >500
Fsb give the ability to optimise
ram speeds
luck
