Then I don't know what is the interest of a dual screen video card when a simple card with vga+dv output is necessary to dispatch the desktop on 2 screens. Most recent cards have this option, and the only thing you'll need after a second monitor will be a dv -> vga adapter (around 5$ at the shop next block)
Recently I bought at this same shop a generic ati radeon 9200se 128mb 400mhz (50$), all simple and first model in nowadays smallest configs, far enough for 2D and DAW, to work with a second hand CRT 15' monitor (around 30$). The card could display much much higher resolution on 2 screens that my own 2 allow, or variable resolution on monitor A and B as well, or CRT+LCD, or 2xLCD, or VGA+DV, any combination is possible in fact, whatesoever all smoothly in a few mouse clicks. There would even be a possibility to plug in a TV (3 screens then), to make all 3 the same screen (for presentations etc), or splitted 2+1, or combi of this with the image upside down etc etc. Except in the screen capacity itself (finding a good cheap second hand screen can be tricky), there is no difference at all in the display quality between screen a and b (when swapping monitors for example), and it never fails nor delays to display complex desktops with many opened applications with animations etc, although I set it up to admit only 4mb extra ram from system (in the bios agp aperture size).
I'm sure lower models (thus cheaper even like 64mb cards) could do that too and very well too (I didn't even tried to save 20$ searching for lower price, but bought it cash from the shop's stock : all done in 15 minutes). To me, in a DAW, a graphic card is like a black hole : when it works for what you want to do, you simply forget about it.
Maybe I miss the point about dual heads graphic adapters, but if it's only to split the desktop in 2 convenient distinct areas, it's pointless as I see it
