I've been sniffing around the same questions.
As for the need for the second Ramdac, remember that Nvidia makes the chipset, and a reference card, but not the cards for sale. So card makers might or might not put on a second Ramdac.
The only card that I can clearly establish supports two CRT/RGB monitors is made by Inno3d.
These guys sell them. Found via various pricewatch searches until something worked. Pricewatch listed the price $10 lower last I looked. Probably can talk them down to the pricwatch price.
Most of the MX boards are sold with TV out as their second monitor. Why there hasn't appeared a bigger market for the 2nd monitor out, a la the Matrox 400/450 cards, is a mystery to me.