Please disregard my previous post. I done further research and determined that previewing anything for motion picture on a broadcast monitor is not the right direction. Any work done for motion picture should be edited and previewed in the same environment as the completed project.
I have no need for 444 at this time since most professional camcorders use 422 for broadcast. The AJA LHe card will work perfectly fine. I guess I was hoping for more features than I really needed.
Al though, the information you posted about replacing the sound card was a good one. That would be a great way to expand audio channels if needed.