First off. Don't get the Raptors. It's not worth the money, for the speed increase, and the amount of space it offers. If you were thinking the Raptor 150GB, just get the WD 750GB. It's the same price range, and near to that of the Raptor's speeds.
Why get the E6850, when for a cheaper price, you can get the Q6600? If your motherboard supports a 1066MHz FSB, it won't support a 1333MHz CPU. Unless you have a 680i chipset motherboard. What motherboard is it, anyway?
And yes, it is possible for SATA and IDE to work together, in the same system.