Sounds like you'd only need two computers if the computers are limited to one DVI out each. Couldn't you get a motherboard with dual PCI-X and two dual-DVI video cards?

4x 2405FP...... Mmmmmmmmmmm...... But if that's the low end of your resolution spec, I'd hate to see what "moderate to high" is.
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FireFox31
110gig MKIIa (30+80), Eutronix lights, 32 meg stacked RAM, Filener orange gel lens, Greenlights Lit Buttons green set