I'd also go with P96. I'm using a PicassoIV here and it works
brilliantly.
I read this in the P96 ver 2.0 docs:
Currently not supported Cards
RetinaBLT Z3:
The RetinaBTL Z3 uses a very powerful graphics processor with a
versatile blit engine. Unfortunately it comes without an automatic
monitor switch which makes using it a bit inconvenient.
A driver for this card is currently being developed.
Not supported Cards
Retina Z2:
This is a quite old card which does only support segmented memory
accesses which is not supported by Picasso96 for speed reasons. So,
this card will probably never be supported.
I'm sure there are people out there using RetinaBTL under P96 though,
so I guess there's since been drivers released, or there are ways
round it.