Hmm, reading through the above linked thread (all 5 pages) revealed exactly what I wanted.

I was going to say... when I followed some of the links through that other thread, I found several different component -> VGA boxes, at least one of which I was sure could do what you wanted. I myself couldn't see how I'd use one of those boxes. But, if I had a good quality 27" monitor on my machine, I probably wouldn't even own a TV.