[Josem]

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Intel Core 2 Duo E6850 3.0GHZ

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this will be better than the quad core q6600 if you're doing one thing at a time (higher clock speed, etc.)

however, if you're running multi-threaded games (which are becoming more common and will be even more common in the future) or multi-tasking (poker + pahud + pt + mth + ahk + web + etc.) the q6600 is better.

really, it depends on your use.

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Western Digital Raptor X 150GB Serial ATA150 (10,000RPM)

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one of these will only be good for your programs - i'd suggest getting the little 36gb version, and using the money saved for one or two (raid 1 if you get two) 500gb disks.

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How much of a difference will I see if I upgrade my RAM to the DDR2-1066?

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you'll need to check your motherboard chipset, but one of them (P35?) has a bottleneck that limits the data throughput.

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How much of a speed difference will I notice between a 7,200 RPM or a 10,000 RPM Hard Drive?

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compare seek times.