Earlier quoted context omitted.
Have you used OS X before? I pay the Mac premium for two reasons: (1) my laptop is supported by tons of Apple Stores across the country, and (2) OS X is awesome (and since it's Unix-based, I can work in the terminal without a problem). There's also a great reselling market for Macs. If (1) and (2) don't really matter to you, go with the Dell. I'll pay the extra price to get exactly what I want in my computer.
This... the cost of my computer hardware is basically inconsequential given that these days I'll often get 3-4 years out of it. If I'm using it for work, that's like $2 a day total cost over its lifetime. I'll happily pay an incremental $1 a day for a system that saves me 10 minutes of dicking around and forgo starbucks if that's what it takes. Justifying choice of your primary work system on the basis of even a $1,0…
My point... the $1000 savings for many comes with no penalty at all. With that said, I don't have a Unix environnemnt requirements, which would change the equation in a big way.