If you get smaller screens on the side, you won't be able to properly align the images between all three screens. The problem will be in the vertical, where the top and the bottom of the monitors won't line up. If it save you a lot of money, though, it shouldn't be too bad. When I first started using my TripleHead2Go I had 21" CRTs on the right and in the center, and on the left was a 17" CRT. The two big guys were flat screens and the left was curved, as well. This was a pretty bad geometry mismatch but really didn't take away too much from the triplehead experience.
You can't output full-screen 3D using more than one card, i.e. you can't drive three displays in 3D mode using 2 7800s. You should be able to, but you can't; I don't know whether to blame Windows, nVidia/ATI, or someone else, but it's not possible. There is a thread here from a few weeks ago where someone spanned a windowed 3D app across multiple monitors, and as soon as he hit the second video card there was a massive framerate drop. No one really knows why, but the best guess is the overhead required to sync the frame buffers of each video card.
The TripleHead2Go will allow you to take the GPU power of SLI and devote it to a triplehead gaming resolution while maintianing high framerates.
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