RE: Unexpected engine performance.
Oh yeah you need a firewire (1394) port on your computer. Not sure if these new cameras can be controlled with the USB interface your camera has, if it is USB 2.0 and your camputer has that, it is almost as fast as forewire.
You definitely do not need any sort of A/D converter, that is the beautiy of the digital camera.
I'LL POKE AROUND TO SEE IF THERE ARE ANY SHAREWARE (oops sorry) packages you can try.