To give you another perspective: I bought a Dell Latitude including 3 year extended warranty for less that a similar powerful Macbook that has 1 year warranty. I had a problem with the motherboard after a couple of months and a Dell technican came to my house and fixed it the next day for free. I dont have to drag it into their shop and give it away for days/weeks like in Apples case. Lenovo has similar offerings for business customers.

On Dells (and Lenovos of course) i can actually replace the battery if its broken (on their business laptops atleast, the Ultrabook Designtrend which Apple invoked doesnt allow this), on any modern Macbook i cant.

My Latitude from 2009 is now still used by my mother and she didnt have any problems with it since i gave to her, power brick is fine, while my current Macbook Air of 1 1/2 years needed a new one recently because the old one had died.

That being said the built quality of Dells Business grinders isnt really that great, but i heared the more "Apple-like" machines are better in that regard.