Welcome.
There's a number of options. If you don't go the scan doubler route, then you'll need to find a monitor that can handle a horizontal frequency of around 15khz. That's almost none of them. I ordered a 19" lcd the other day from an ebay store that claims to go this low. I'm hoping to get it today and post my results tonight. The guy had 30 or 35 left last I looked. I suspect if it works we'll all buy him out.
brian