if you have a SOG monitor, all you need (if you dont want to solder) is an xbox HD cable, a triple RCA joiner, and a male RCA to 15pin VGA plug adapter. using the joiner to put these two together, you can plug your xbox into your PC and use the VGA bios to output to the monitor.
that would be about $20. $10 for the component cable, $3 for the joiner, and $7 for the converter. all from ebay, much cheaper than the x2vga.
only problem is the KOTOR and other games output wrong.
anyway, as a note, the ONLY way the cables work is that they output in HD formats. Otherwise the screen cant read them.