VGA Box for Older Game Consoles

I am looking for a VGA box that has standard AV and S-Vid inputs so I can use my Saturn or N64 for example on my LCD monitor. Every one I find however either scales to a default 4:3 resolution or is like 1600X1200. My 22 is 1680X1050. Does anyone know of a VGA box out there, other then the XRGB series that will scale to 1680X1050 and has AV/S-Vid inputs. Im seriously going crazy looking for one. Thanks.