Green-screen live monitoring advice

Hey guys, I'm a hopefully soon new Macbook Pro 17" owner..

I have a question somewhat unrelated to mac specifically (other than software video editor advice). My question is:

What do I need to have equipment and software wise in order to do green-screen video's where I can be in front of the camera recording myself with a green-screen (which i already got) as my backdrop and be able to see myself on the camera/computer/external monitor live with whatever background that I choose to put as a layer on the greenscreen..

In other words, like pro weather reporters can do - they stand infront of a green-screen and are able to see where their hands are pointing, looking at a screen that's behind the camera which is filming them live...

(so far I got the screen and various cheap cams untill i get a hd camcorder..which will probably be a canon s21 or something like that, unless I need a specific camera that has fw out or something like that?)

Hope someone have som suggestions on how to do this at a low budget, but still with good results...primarily for youtube and music videos..

SilentPanda said:

I believe you can use Photobooth actually. It can remove backgrounds and replace with your own. Unless you want to do something more complicated...

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Aight, cool....What I'm specifially wanna get some advice on, is how I can use this technology live. Meaning, I don't wanna stand in front of the green-screen and record and then edit afterwards. I wanna be able to (on my computer or on the camera's screen or on an external lcd) see a background movie/image's that are playing AS I'm recording myself standing in front of the green-screen, so I know the reference points and can do some "acting" and "walk on water" for instance, being able to actually see where the water is relative to my feet and such....(hope that makes sence)

I'm sure the camera needs something special in that regard, and that not all editing programs can handle this request....Anyone actually doing this or know what I'm talking about that could help?

Sounds great ! Thanks