That sounds like an Apple 8bit monitor, not a 'Macintosh' monitor... If I'm right it won't work on a Mac (not practically, technically you could, but you wouldn't want to).
That monitor will work fine with your current video card. If you work out how to get an LCD working on your video card, you'll be able to dual screen with your two video cards.
That monitor will work fine with your current video card. If you work out how to get an LCD working on your video card, you'll be able to dual screen with your two video cards.