Best Graphics Card for older MB

I have a machine built on an Asus A8N-SLI MB and would like to know a top end card I can get that will work in that Motherboard , preferably Adobe certified for Prem Pro and After Effects
Thanks .
MB Specs
http://hothardware.com/Reviews/Asus-A8N-SLI-Premium--NF4-SLI-For-AMD-Refined/
Expansion Slots
•_2 x PCI-E x16
– SLI mode: x8, x8
– Default (single VGA): x16, x1
•_1 * PCI-E x 1
•_1*PCI-E x 4(x2 mode)
•_3 x PCI
Supported NVIDIA graphics cards for GPU acceleration
* GeForce GTX 285 (Windows and Mac OS)
* GeForce GTX 470 (Windows)
* GeForce GTX 570 (Windows)
* GeForce GTX 580 (Windows)
* NVIDIA Tesla C2075 card (Windows)/Maximus configuration
* Quadro FX 3700M (Windows)
* Quadro FX 3800 (Windows)
* Quadro FX 3800M (Windows)
* Quadro FX 4800 (Windows and Mac OS)
* Quadro FX 5800 (Windows)
* Quadro 2000 (Windows)
* Quadro 2000D (Windows)
* Quadro 2000M (Windows)
* Quadro 3000M (Windows)
* Quadro 4000 (Windows and Mac OS)
* Quadro 4000M (Windows)
* Quadro 5000 (Windows)
* Quadro 5000M (Windows)
* Quadro 5010M (Windows)
* Quadro 6000 (Windows)
* Quadro CX (Windows)
Answer #1
You don’t really need a “top” end card for what you’re doing…
Better to spend your money on a new system rather than a new graphics card because your PC probably can’t run it due to a weak power supply.
But the answer to your question is the GTX 580.