As far as it's a standard arcade monitor (15 kHz only), these presets are possible, from more conservative to less:
- generic_15
- arcade_15
- arcade_15ex
Usually arcade_15 is a good compromise. To judge if you ought to use the arcade_15 or arcade_15ex presets, try a game like 1942, on an horizontal monitor. If the screen goes out of sync, then go back to the previous preset (generic_15).