Best codec for green screen in FCP or Motion

First--I tried to search for posts on this topic, but I swear I cannot figure out how to search -the discussion forums- on this site. Anyone want to tell me what I'm missing?
My main question is about codecs for keying green screen in FCP. I have always just worked with DV but it does not key very well. I am about to go into a project that involves editing 25-30 hours of studio footage down into about 5 hours of finished product, all of which is going to be shot against a green screen. We're using high-quality non-digital NTSC cameras for the shoot and encoding to hard drive, which gives us the option of using a different codec. Since we need to capture so much footage (various takes, camera angles, etc), I don't have the budget for the hard drive space required to capture it all uncompressed, but I'm looking for something better than DV.
I've seen some people are using DVCPRO 50 for green screen work, and I think I could get all the footage onto a single 1TB hard drive in that format.
Is DVCPRO 50 significantly better than DV for green screen? Is there another codec which would be better to use with FCP/Motion, but still keep my data under 10MB/sec?

Is the difference between 4:1:1 and 4:2:2 some part of what causes the blockiness in DV?
No...the DV compression is what causes the blockiness of DV. It is compressed 5:1, and how it is compressed is the cause of the compression. Mind you, if you shoot to DV tape, then capturing that as DVCPRO 50 will not get rid of the blockiness. that is there when you record to tape. It will convert the footage from 4:1:1 to a 4:2:2 color space for better color control when keying and color correcting. But much of the color information is already lost when you shoot to DV tape. Capturing as DV50 will certainly help, however...and be TONS better than keying as straight DV.
Shane

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