But that's using three cards.
For best quality 2D output, you can not beat the Matrox Parhelia. Expensive it is, but worthwhile AS LONG AS you have decent monitors to put on it.
There's no point buying the Parhelia at the price it costs and then using anything less than a very high quality 19" or 21" monitor (or monitors) on it. Example monitors are the Sony G420, all Sony 21", Lacie Electron Blue IV (both 19" and 21"), Sun 21", Dell 21" (sony based), Compaq 21", IBM 21" (all sony based...), Mitsubishi diamond PRO series.
For a cheaper alternative with output quality ALMOST as good as parhelia you want to look at Ati 9500 and 9600 models.
NVidia cards are fairly poor in 2d by comparison, although improvements have been made. GF2 series were terrible, GF3 were better, GF4 are supposed to be better still and who knows what with GFFX. Still not up with Matrox or ATi as far as I know though.
My ideal setup would be a Parhelia with a pair of Sony F520 screens, both run in 2048x1536x32@85Hz.
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Mostly Full Frame user!
EOS Tree + Nikon Coolscan III
Deef Hurty.