Green-Screen/ Camera question...?

Some friends and I are making a movie, made entirely by teens. I am the Producer, animation department, director, legal consultant, and much more. You can imagine that I have a stressful position. We are planing on having a CG scene at the end, but want the people to be real. I already have a 3D model of everything that we need built. I only need two things. 1) a material to use as a "green screen". Do you know any type of fabric or material that we could use as greenscreen. Any suggestions would help. Do you know where we could order greenscreen? 2) I need a digital camera that will allow me to download it's content onto my computer, then edit each of the frames individually, preferably on my editing program. What type of camera should I get. (I would like it to be fairly high quality. (Budget is not much of an issue). Better yet, I would like it if that camera would let me save each frame of the movie as a picture, so I could make it easier to edit in my editing program.

Note: I am talking about digital motion cameras. (Like a camcorder, but digital)

Thanks in advance.

regardless of your editing program you should be able to download and edit your fottage. you just need a camera with a firewire interface and possibly the drivers so your computer knows what's being hooked up to it.
as far as green screens you can use almost any solid flat material. there is a particular shade of green called chroma key green that is made especially for green screen effects. you can paint a wall or piece of plywood.
most brighter shades of green or blue will work. and any program like final cut or premiere will have the appropriate software. basically all you're doing is extracting the people from the blue/green background. this works because blue and green don't exist in human skin tones. just make sure your actors don't wear blue or green otherwise the exctraction will take out huge chunks of your actors.
hope this helps and good luck.

On adobe premiere 5.0 i think there was a feature to do green screening which could use just about any colour you wanted. The main issue was with lighting. You want your backdrop to be lit consistently so that each area of it is the same colour. So, say if you were using a red backdrop for example, if there was a lot of variation in the appearance of the red (hue, saturation, lightness) then the range of reds that the computer would have to extract would increase, and you might potentially have to eliminate some of the reds on the bodies of the characters or props that you wanted to keep.
Fortunately, the program also had the option of whether you wanted the green screen to be contiguous or not - so you could have it quit removing the background once it reached an outside edge of something. So basically, if you had a man in a blue suit with a red dot on it, and a red background, it would stop removing any red once it met the edge of the blue suit, so the red dot wouldn't be affected.

As for cameras...if budget is not an issue... We used Canon XL1 camcorders. They shoot in high enough resolution that you could play it in a theater. I think they actually used those for Star Wars Episode I...which was pretty unconventional considering that most feature films are still shot with actual film stock.

-Rob