What you want is a multiscan monitor.
I was using phil CM8833-II before then i discovered to utter astonisment that after all these years (well 2) i found that one of my monitors from the Acorn (the AKF18) was one so borrowed a mates 23pin amiga -> 15pin VGA adapter, picked up the coresponding connectors (of which i already had), and made my own adapter saving me £15!!!!!!
It also acts as a monitor extension lead which is a bonus!
Now i can use it with my Amiga 1200, playing old games with no trouble and using the workbench under multiscan mode!
