Well, I am using an iMac 2.33 GHz Intel Core 2 Duo / OSX 10.4.11 /
NVIDIA GeForce 7600 GT / 3GB RAM.
So far everything works very well with any software I am using (Photoshop, Illustrator, Final Cut Express, Toon Boom Studio / Digital Pro PLE, Cinema 4D 10.5 …
(Especially Enhanced OpenGL works beautifully with Cinema 4D).
Sorry, can’t commend on those other cards.
(I have only heard that some people had Enhanced OpenGL issues, not displaying the Shadows properly, with the ATI Radeon HD 2600 in Cinema 4D)
Cheers
Nolan