Oh Boy! I don't where to start.
But you just want answers about a monitor. Most modern monitors (should have a VGA AND DVI input) will work with the video card. With the native A4000D motherboard (sorry, it appears you have a "towerized" A4000 desktop) video output -- that 23-pin D connector -- you need a monitor that synchronizes down to 15 KHz. The scan doubler brings that up to 31KHz or standard VGA. The CyberVision card is your video ReTargeted Graphics board and can handle higher frequencies in the normal PC computer range. The ImpactVision 24 is a "Frame Grabber" board and is best left out of this discussion for now.
With your hardware I would forget the CBM 1942 monitor and get a multi sync monitor that can handle all of your video output. A recent discussion on the boards (this forum I believe) brought to light a Dell SR2320L & ST2320L monitor that sells in the 150 USD range off *Bay, is flat screen, 23" and looks great in 1920 X 1080 resolution (for other uses). The CBM monitors should handle games and trouble-shooting, but aside from Toaster work or perhaps showing Frame Grabber stuff, they are useless to me. Now if you only ever plan to play games, then sell off most of that system. Otherwise, get a good monitor, an Amiga "The Basic's" manual or book (or a lot of time taking notes off the web), a copy of Amiga OS 3.9 (or a CSPPC accelerator and OS 4.1), and start asking lots of questions on these forums. Please don't ask the same question on all the forums, it gets redundant as some of us read them all.
