Some of the Geforce Ti4200s (asus) and Geforce FX5600 (gainward, asus) over at newegg.com are dual DVI. Slightly cheaper than matrox cards I believe, with better 3d performance (that may make no difference).
true matrox is not a top of the line 3d and and it is a little more expensive. geforce are nice cards too. really any video card todfay with 128 ram will so you nicely. good luck finding dual dvi cards, post it here after you find one.
ryan