Christian,
Your dilemma is one I've faced for years. Contrary to popular belief, the Mac notebooks don't have that great a screen and are lower res. (I calibrate my wife's Macbook Pro on a regular basis. It does a decent job, but not enough screen resolution for me and uneven angle of view.)
For a while, I used Sager notebooks, because they were the only ones offering a wide-view, WUXGA+ matte 15 inch screen. Their screens calibrated very well -- comparable to my desktops. Unfortunately, no more.
My most recent notebook purchase is the Acer Ferrari 5000. It's one of the few out there with at least a WSXGA+ screen (1680x1050). It calibrates well, and though it's a "glossy", it's not obnoxiously so -- like HP or Compaq or even Sony. Luster??
My ancient Sager still had the best screen -- UXGA+ 1600x1200, bright and accurate. If you can get a look at the Acers, they may do the trick for you, as well as being fairly decent computers on top of pretty good hi-res screens. I do a lot of pre-press conversions on location (invariably because I'm on one job while finishing another), so I need something that's accurate and that I can rely upon.
Nemo