That is 100% of the reason why I won't get DVD recorder or other stand alone digital recorders. Though, I imagine there is a PC capture card that may do the trick, no stand alone DVR can record HD or has component inputs.
Cable boxes with built in DVR will cost an extra 10 bucks a month - compare that to a $300.00+ recorder and that's about 3 years worth of product. By then it'll be time to upgrade anyway!