Advice on Mac Pro build for Resolve Lite

I'd like to turn one of my Mac Pro machines into a Resolve workstation.

Its a 2008 3,1 2x 3Ghz Quad-core machine. This will mainly be for 1920x1080 ProRes 422 jobs. No 4k or 5k work.

Currently it's configured like this:

Slot 1: Nvidia 8800 GT
Slot 2: Kona 3
Slot 3: Empty
Slot 4: Atto Celerity FC-41ES

This is how I plan to set it up for Resolve:

Slot 1: Nvidia 8800GT (GUI)
Slot 2: Nvidia Quadro 4000 (GPU)
Slot 3: Black Magic DeckLink Duo
Slot 4: Atto Celerity FC-41ES

I'm a little confused about the DeckLink compatibility. I see people mention that you can use the $300 Black Magic i/o card for resolve, but the official config only lists the Decklink HD Extreme as compatible. Can anyone confirm that the DeckLink duo will work?

Also, does anyone think that Black Magic might announce AJA support at NAB? I'd prefer not to buy a new I/O card if I can avoid it.

Anyone see any problems with this setup for Lion?