Ok, be patient, you are dealing with the I.T. challenged......

I'm thinking of taking a laptop from Oz to RSA for email and storage of video, music and for the kids to watch DVD's.

What do I have to look for in buying a laptop ? I'm most concerned about powering the thing. I know I will need a plug adaptor and also a 12V invertor for use in the car which I have.

Do I need to watch out for anything else ?