Re: External Scaler Suggestion? WS65813
I also looked into external video scalers that up-convert standard video to "HD quality", and then decided against.
Today, it seems more and more preamps and receivers are having up-converting scalers built-in along with HDMI switching. Also included is up-converting composite, S-video, and component connections to output on HDMI.
I would definitely look into upgrading your preamp / receiver before buying into the external scaler idea.
Also, HDMI to DVI converters have been around for a while. I have friends that have not changed out displays because they are happy with their HDMI to DVI conversion.