Wow -- another one of these types of threads. Not surprised. Here's my pat answer...
As a person who uses his computers for business, I want and need the best. Sure the hardware outlay MAY be more, but how valuable is my time? If I have less trouble of the next 4 years (which is what I expect my computer to give me at least in service), then whatever I spend over and above the cheaper competition is worth it. I buy the best to last the long haul, not save a $100 in the short term.
Off the path (but not really): I know people who have made literally a million dollars with pirated software that costs $450. How cheap do you have to be? If you're in college, yeah, I can see trying to cut costs every way you can, but most of us here are making money with our macs/pcs... I don't know how anyone can quibble over someone else's decision to try and buy quality.