I guess it's a toss up between Picasso IV and CV643D, as both can work in either ZII or III mode.
I have an A2000 system with Blizzard 2060 and Picasso IV, and I can't complain. :-) The built-in scandoubler of the Picasso was the reason why I went for it.
CV643D is the only way of having accelerated 3D graphics with A2000 though, but I hear that the 3D capabilities of CV643D are very poor compared to Bvision or Voodoo 3.
