Go to an Apple store, play around with the Powerbooks they have in stock. If you like what you see, feel, hear, imagine it twice as fast and buy the new MacBooks when they ship next month.
Also go to Best Buy and take a look at the PC laptops and see if anything there compares to your experience with the Mac laptops. If it does, buy it.
Quite honestly, most people don't need sick amounts of power in their laptop. I have sick amounts of power in my desktop, and I have a 5 year old Mac Titanium that has a tenth of the power of the new MacBooks and it suits me just fine for writing, e-mail, surfing, itunes, iphoto, imovie, watching DVDs, etc. In fact, if you go with a MacBook, be smarter and buy the one with the slower processor and save yourself $500.