It sounds trite, but there is a kernel of wisdom there. Buy a Macbook Pro if you can afford it.
If you have the budget, you'll get what you pay for. It has the only extended warranty for any electronic gadget that Consumer Reports recommends. It will run any OS you like. It will last for 5 to 10 years depending on your needs (games vs web/email, respectively). You can spend a similar amount and get a comparable or slightly better hardware package from Dell/Alienware, but it won't come with the warranty, OS options, elegance or robustness that Macbook Pros are famous for.
This suggestion will start a flame war. You're going to hear from fanatics from both sides. However, I manage a mix of computers for both a small business and a household with several power users, and I have learned firsthand the strengths and weakness of both camps.
Windows' strengths are in gaming and technical/engineering applications. If you want access to the most games, or need to run CAD/FEA applications, then you should buy a Windows desktop machine. Not a laptop, but one that you can upgrade piecemeal as your needs evolve. Build your own, or arrange to have one built for you, and you can get a spectacular set of hardware specs for a very low price.
However, if you want a casual use or business laptop, then Apple's MBPs are the best available, even if you intend to run Windows exclusively. The extra money you spend will eventually pay off in 1) time saved in building it, and 2) the time saved in maintaining it. The 2.2 GHz 15-inch models offer the best price/performance ratio if your budget is constrained. Otherwise, I recommend buying the 17-inch 2.5GHz quad-core i7 - it will last the longest before you need to purchase a replacement.