on all amigas the question is not just the resolution, but the colors too. For example an aga machine can display all of its modest at 256 color. AFAIK aga can display similar the today standard 1024*768 or 1284*1024 but you can use it only for displaying pics, because anything will be horrybly slow for an aga. (workbecn desktop, games etc.)So max 640*256 at 256 color for wb.
With a pci busboard you can use some standard vga pci card. (voodoo,s3, and with the mediator tx Ati radeon 9200-eseries card.) It is much faster than aga, and you can display 1600*1200 or anything if you want. Only limit is the size of the vga card memory.
Unfortunatelly vga card's cannot display the native modes. You can use a lcd-tv monitor to do that, or use a tv card on your amiga. (with pci busboard of course.) But keep in mind that the PIP mode on your tv card will be not the highest!
