I suppose its a matter of personal preference and just sets up another mac vs pc flame war. My advice is try to get a chance to produce on both platforms and see what you like best. I have an average PC laptop and it does the job for me. Travelling wise, very important factors are battery time, weight, size, etc. (I suppose thats common sense).

I checked out the new MAC laptops at the Apple SoHo store in NYC and I must say I am pretty impressed! They're built like frickin' tanks and won't bust easily (I'm guessing), and Mac users claim they're ultra solid.