Calling all Mac users...

So I need a "Mac" computer (whatever that exactly means) primarily to be used for creative writing, though not by me. There will also be a minor requirement to upload photos from a digital camera but not particular need for PhotoShopping, etc. And in the long term, there's a small possiblity that it may be used to create short video clips like you might see on YouTube.

Being completely unknowledgable about such things, I'd be grateful for comments, concerns, recommendations, or any other information that might assist me in choosing the right machine.

Thanks.