Well, you have a lot of options with the three display options you mention. Get a A520 device or a RGB --> scart to connect to computer to the tv, or get a scandoubler for the videoport or the RGB port to connect any monitor to you Amiga.
I have been using a MicroniK Scandy In myself to scandouble my signal to 31 Hz, but after I have replaced my monitor, it's not really needed anymore.
