New Computer Time

So Im in the process of looking for a new computer because as much as I love mt little Mac book, it sucks for wathcing movies on. However, I do love my Apples so Im looking for a good deal on one with a gigantic screen so it can double as my TV. Pretty much, I don't need TV anymore unless I want to play on my Wii. They really need a way to make it so I can play my Wii on my Mac. If anyone knows if that is possible and wants to let me know how to do it, I will love you forever!