same boat as you and nearly identical setups. I haven't gave much effort besides going through the steps quickly.
I have 3x 24" monitors with a 5870 running two of them with a nvidia 8800 running the third. This was my only alternative for 3 monitors for the past few years (excluding matrox - refused to consider it an option). I have a DP adapter on it's way, and hope to poke more within when I am able to remove the second nvidia card.