However, as a FX1 user, do you feel you have already maximise your camera fully?
Because getting an expensive HDV cam doesnt not mean your footages will be better - I have used 3 different HDV cameras extensively, A1 G1 H1 and I must say the only way you can tell the difference betwee A1 and H1 is in a controlled shoot where you have sufficent lighting, etc.
Unless you are doing really specific sort of production I feel that the FX1 is good enuff.