If you have an unlimited budget, raptors are ok. They outperform SCSI sometimes in single-user tasks. If you are running a server that is going to be used by anything more than a handful of users, go SCSI.
If you want to load windows faster... WTF are you doing that requires your computer get reset more than when you have to update something.
IMHO, raptors are a complete waste of money. They offer almost no real-world advantage over a good 7200rpm drive. They offer *NO* advantage in gaming (assume reasonable amount of ram). Buy them only if you absolutely need that last drop of performance for what you do, or if you want to make your e-peen look bigger in the worst possible way.
For EVERYONE ELSE raptors are a complete waste of money because for the money saved they could apply things to their system which actually have a HUGE impact on real world performance (more ram, better vid card, reliable power supply, etc!)
And you guys.. your corvette analogy falls apart... Corvette Z06 anyone? Out performs ferarris for half the cost!
But then again, the analogy works. A regular vette will be the *BETTER CAR* for you than a ferrari 99% of the time. Great gas mileage, useable trunk, reliable engine. Better price. This is like a 7200rpm sata drive. Great performance, great price!!! Or, you can pay a LOT more for a LITTLE more.