Well I'm gonna be honest with yah. . .
Mac are stable and clean, the OS X is great and the portability is great! but. . . If your gonna use it for video editing, stay far away from it!!!! Now people say oh well the Mac's are way better in graphics and stuff. Well they are right!
BUT! They are "not anymore" on the video end of things.
Trust me I know, I've used PC and MAC's for 3 years now in and out of my work enviroment. The Mac's DO have the fastest pipelining but rendering and compression is a nightmare!
I've use the G4 Powerbooks, iMacs and the G4 Power Mac dual proccessors. Then I have my own custom made PC and I've used some Dells and other systems.
At my school we have the latest G4 Power Mac Dual 1.42GHz Processors with a 21" LCD screen and 17" screen with a ATI 9700 Pro. We just got it recently, only have 3 of them so far and are in the production editing room.
I did a little test cause I was jelous with my own PC and I was intersted. I took a 3 min file about 4.3GB big (raw data) and compresed it. I timed it and it ended up my windows PC won! I was surprised at first, but then realized that well MAC's arn't all that are cracked up to be on the power end. My PC is a P4 2.4GHz with a GeForce Ti4600, the mac had a 400MHz speed over me and a graphics card that is supposed to be almost twice as good as mine! Also it had way more RAM than mine did and a way bigger HDD. I did more than one test to be sure.
So there you have it! Only way you would get me to tell you to buy one of those power books is that the computer you have is way slower. But then again those Lappys are expensive why don't you put your money into a custom built PC instead. Or get a top of the line Toshiba Laptop!