Greetings all, a new member here

Here is my dilemma: I purchased a sweet SGI 1600SW Flat Panel monitor about a year ago. It came with a Formac3 graphics card, pretty much the only card available at the time that could handle 1600x1024 resolution. Well Formac has decided to give up on trying to develop for the Mac so I need a graphcs card replacement that will handle the high res requirements of this monitor (with acceleration) under OSX. Any help would be appreciated. Thanks in advance.