Interesting answers, I thought Beta would have given you better results. One of the biggest problems with using DV cameras for this process isn’t the color but the fact that all mini-DV cameras use a heavy compression. When shooting a subject against a bright blue / green with cause very contrasty edges which get highly compressed and cause lots of artifacting around the image which can cause a harder process to remove the crunchy blue / green edge around your subject.
Everything they mentioned is true. Good lighting, better cammeras and so on. Best thing is to shoot uncompressed, digitize in to your computer uncompressed and that would give you the best results. But I understand the money thing too.
-Lars