I don't hate Apple, their design is very elegant and sophisticated in some ways. Great looking stuff.
Their owners, however, are another matter. Almost all of them are smug, arrogant and condescending in their attitudes to anything that's not Mac based.
I use PC's because the propriatary software I use for stock and currency trading only runs on Windows. Most financial software is Windows based. And yes, I know I can buy a C2D Mac now that would run Windows, but it's easier to build and change things with a homebuilt PC. Besides, it's more fun.
I don't know if the C2D Macs are faster than the old ones, but Macs always seemed slow to me compared to a good PC. Plus, I hate Mac mice.
I'm also running 2 monitors and may get 2 more for a total of 4 for my trading. I have a lot of programs and multiple charts open at one time.
I think this would be much more expensive with a Mac.
I looked inside one of my cousins old Macs, and guess what, it had an ECS mobo, a cheap ATI graphics card and ordinary cheap RAM. But Apple sure charges a lot for its extra RAM and such.
I guess it depends on what you're using your system for. All my friends who are graphic design artists and musicians use Macs, but kprobably very few serious financial or stock traders do.