I have a HICON brand LCD that I got from Australia that can sync to all display modes from my Amiga 1200 using just the RGB to VGA adapter.
It's not perfect though. Some modes do not fill the screen or they appear off-center - the PAL modes seem to work better than the NTSC ones. Additionally, the quality of the LCD itself is not very good in terms of black levels and viewing angle. In the end, though, it does the job of showing everything the Amiga can output and has a small footprint on my desk.
I can look up the exact model tonight if you want.