After using Ubuntu for a month now on my laptop I'd have to agree with Brickybob, Mac really isn't all that different from Ubuntu.
I can support this statement with experience as my family has an iMac G4 in the kitchen, we use an Intel iMac (G5 I suppose) for our recording studio in our basement with Logic 9, my mother has a Macbook, my brother has a Macbook, my sister has a Macbook Pro, and when my PC pooped out last summer I had to use the recording studio mac for three months.