A better camera wont help unless you are recording to HDCAM SR or better. I saw a test EX1 v F900R greenscreen both recorded HDCAM SR, the production went with the EX1.
I know what Monday means and you would think by the time I've laid out a load of cash to do direct recording that I could buy a better camera but having looked into it, the options for this are actually really thin on the ground. Monday might be right that I might be able to get like a second hand digibeta camera or maybe an older varicam or something if I really scored a special deal but in the newer market theres not much out there.
The next cheapest option would be the panasonic HPX 300/301 I think, which is a CMOS based P2 camera with fancier new codecs. The AVC-intra 100 codec looks nice and has 4:2:2 The CMOS should finally give a big resolution jump from the ccd cameras like HVX etc. People say the cmos can do the wobble but in a green screen situation I suspect this would never be an issue. Seems like almost the ideal green screen camera but P2 is sooo expensive and even the camera alone is out of my price range.
Strangely getting a very cheap camera such as hmc150 or even something cheaper like HMC40 or JVC HM100 and feeding to one of the new direct recording technologies might work out more straightforward. There is a new device that takes compact flash cards and can record from the hdmi coming out for about $3000. Looks interesting.
However I suspect I will end up using an old HVX and a firestore. It seems the cheapest option just now.
Strange how few choices are out there but at least there are some!
Thanks so much everyone. I feel much clearer on this whole issue now with your help!
Seems the consensus is definitely more colourspace.