you dont need a new card . the application will give you the choice to capture to different codecs, dv-av is the one i always use as it will give the best quality for editing and then you can convert after the fact for whatever medium you fancy. it is high file size and the capture rate is about 130 MBps.
its best to capture digitally, this way you retain all information before you decide what compression you want to use after you finish editing , so using fire wire to do this , is your best approach.