Realtime Chroma Key option for Final Cut (DVCPRO 50 and better)

Years back I used Pinnacle Cinewave on the Mac with Final Cut Pro to give me realtime Chroma key for DVCPRO 50.

Would never go back after editing with this, relatively affordable, method.
(Compared to the alternatives back in the days which was Avid Symphony I believe.)

The other low end options were Kona and black magic (I believe, could be wrong) but they did not give real time chroma keying for finalcut pro for DVCPRo 50.

Now my question is quite simple really, after giving a bit of back history -
I have been out of the video field for about 3+ years and am looking at getting back into it.

Knowing that Pinnacle Cinewave is dead (am I not right) for Final Cut Pro) are there other options out there for real time chroma key for HD?
- Yes, I know HD is not DVCPRO 50...Im looking at stepping up. ;)

I know that there are HD cards, but what about realtime keying...again, once you get spoiled, its hard to go back.

What is the best options, or is there any, for Final Cut HD for realtime chroma key?

Thanks

dAlen

p.s.
I tried to post the other day, but it didnt get posted for some reason - hopefully this gets up.