ADC breaks out to DVI pretty cheaply, because it carries the same video signal and the adaptor just ignores the extra power/sound/usb pins. (does ADC actually have sound?)

Once you have DVI, a DVI-HDMI cable is pretty cheap too for a no-name one.

For the CRT, DVI-VGA adaptors are dirt cheap and plentiful because everyone who buys a video card these days gets 1 or 2. Apple even used to give you one for free on PowerMacs and PowerBooks... Once you get VGA output, then a normal VGA - 5xBNC cable should hook up OK.