I know I sound like a broken record in these threads, but:
You should check craigslist for professional monitors.
There were a number of monitors made in the late 90's and 2000's that support multiple arcade resolutions and have easy to access H and V controls. Several of the monitors will remember them.
The two that immediately come to mind for what you are looking for are the NEC XM29 series of monitors and the Mitsubishi XC29 series. Both will do what you want, and can sometimes be found on craigslist or at surplus auctions for a little of nothing. I got my XM29 for free just by asking after the auction was over. They were going to throw it into the recycling heap.
You can search this forum for more info, there are a number of threads on different models.