Superdude, then you are running alot of games in strech mode ? What software are you using to get you Trident to funktion with the monitor.
If i use the arcadeVGA will it be nescessary to use the Ultimarc video amplifier ?
Do you have any pictures inside the cab of you modifactions ?
I used Easy Mame Cab CD as base install.  It has advmame and advmenu for Medium Resolution Monitors using a Trident Blade 64 Card.  The card is 36.45 shipped. 
I was able to program all resolution through Advmame without stretching for most games.  It looks really nice, except you will have interlacing on a few games.
If you are going to use the Arcade VGA card you will need to switch the monitor to 15khz.    You will not need a jpac, however it is easy to wire if you have one.  The arcade VGA card is a very good card and I own one.  I have not plugged the monitor straight from the pc.  I do not know if it needs an amplifer.  I doubt it does since the monitor is a newer type.