The Shark PPC has:
1. never been released
2. requires a PCI slot and therefore will only work in a towerized A1200.
3. Neither AmigaOS 4.0 nor MorphOS ported to it due to item #1.
The Blizzard PPC is rare and expensive. It will be difficult to find a user willing to part with one. It would someday be able to run AmigaOS 4.0, however, and when used with the BlizzardVision graphics card works with MorhphOS currently.
The PowerVixxen LT is not released yet but will come with AmigaOS 4.0 when/if it does come out and will be a fair bit faster than the Blizzard and will come with a graphics card and enhanced sound capabilities as well. This should work in a desktop A1200 although there is rumor that an A3000/4000 version will be better and faster (comparable to the Shark).
