What is a good Apple laptop for me?

I don't know my Apple iBook from a hole in the the ground - assistance is required.

What I want a laptop to do (Apple or Windows based):
  • WiFi access
  • Plug straight into a TV
  • Play any region DVDs
  • Be fast enough to cope with YouTube, Joost and the like, in full screen
  • Run Firefox
  • Run Skype
  • Store and play my whole CD collection (in a 'mobile' format and not with some DRM crap)
  • Cheap to buy (I'm thinking TradeMe - good idea?)
And that's it really.

Thanks in advance to assistance/advice via email (miramar.mike@gmail.com) and/or left as a comment

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