What graphiccards works good with kona and leopard? GeForce 7300 GT is driving me insane!

If you dont want to read this, just tell what graphic card you have that is working good with aja lhe.

Please tell me about your good working mac configuraions. Im particle interested in the graphic card.

Background story:
I bought the 8core on release back in 2007. Everything worked great until I installed leopard. With every Aja update i still get the
"Final Cut Pro requires that your system have a Quartz Extreme capable video card" error.

So what graphic cards is working with aja kona lhe and leopard 10.5 or 10.6? Im so tired of my messed up workflow (i have to reboot everytime i want to use the aja with shake or final cut). And with aja 6.0 it works with reboot, but 6.2 freezes the mac pro on startup. Today i updated leopard from 10.5 to 10.6 and i tried to switch on the desktop feature to se if it had solved any problems. My luck again, i got the bluescreen of death (it freeze on startup). So Im going back to the timemachine backup i just did before the update right now.

So what is working for you guys????

Cheers
Joel