There is truly no way to film off of a screen and have an absolutly fantastic picture quality.
However, setting your refresh rate to a refresh rate that fits evenly into your TV format's refresh rate may help with the scan line effect, e.g., if filming in PAL, set your monitor to 100 or 50Hz, if filming in NTSC, select 60 or 120Hz.
This helps reduce scan lines as tthe scanning is done in better synchro with your CCD captures
It's not about what camera you use or how much it cost.
It's about what you shoot,
how you shot it,
and how you edit it :P