Lets compare a Digital Storm x17 Laptop to a MacBook Pro 17-inch.
http://www.digitalstormonline.com/laptoploadx17.asp?id=568682
http://store.apple.com/us/configure/MD311LL/A?
The first difference is the price(The PC is $750 less than the mac) , but that could mean that the PC has less powerful parts. I will be configuring both computers to be the same.
I did the same comparison years ago before moving to a macbook pro. You are right: pc laptop is less expensive than apple laptop, given the same parts. But Apple wins because they spend a lot of time in designing phase: their laptops are thinner, make less noise (which is really good, if you have to think while working), the screen is spectacular and so on...
I bought a mac and never regret about that. It's really a machine you can rely upon.
You should consider the costumer support, too.
My wife bought a Toshiba for her mother. It had some trouble and Toshiba support was ridiculous and unuseful. They also told me that, given the serial number, our computer should not exist in my country. We bought it from a big retail brand, not from black market.
Apple has also a good customer care: I've experienced it by my own hands. They swapped me an iPod nano because my sweat ruined it.
I opened a bug ticket for the iPad because it seems to me (like to many others) that since iOS 5.1 it drains more power. Apple called me from U.S. to acquire more information.
Just to be clear: I never subscribed Applecare. This is the standard service.