First of all USB devices are not good for this purpose. Pinacle makes a USB 2.0 version, but you'd need a USB 2.0 port to get it up to speed.
1. How do manufacturers of TV input devices make their money? Hehe, how do manufacturers of VCR's make their money? It's just a device that turns your PC (including laptops) into a video recorder.
2. I'd go with the unit I mentioned above.
3. There AREN'T more than 125 standard cable channels, you need a special cable box to get more (even on a television), in which case the cable box is the tuner, and has to be connected to the PVR as an input device.
<font color=blue>Only a place as big as the internet could be home to a hero as big as Crashman!</font color=blue>
<font color=red>Only a place as big as the internet could be home to an ego as large as Crashman's!</font color=red>