@ Lodbro
Zorro graphics cards can be expensive to buy, unless you get a result on EBay.
You might want to try the Mediator PCI busboard for your A3K. You'll probably need to mount your system in a larger case to fit, but you'll have access to a wealth of PCI cards at a fraction of the cost of their Zorro equivalent.
A Mediator board has drivers for PCI Voodoo cards from the Banshee right the way up to a Voodoo 5. You can also fit Soundblaster, 10 / 100 Ethernet and USB cards to your Mediator system so they're well worth consideration as in terms of performance the Voodoo range is way ahead of anything currently avilable on the classic Amiga line.