@ Franko
I know you probably want to keep your A1200 in the "wedge", but seriously consider putting it in a tower with a Mediator board and a good Radeon card.
I use a 256MB Radeon card in my A4000 to give me some very nippy 1920x1080 displays. Before that card arrived I tried it with a 1 or 2MB no-name ViRGE card yanked out of an old Pentium PC and that worked quite nicely with the standard ViRGE driver.