the titans have 2x dual link DVI. so if you have 2x titans you can hook up 2x of your dual links to 2x monitors, and hook one of the dual links off the other card to the third, sli and your set.
each card supports 2x dual link displays, right in the specs
if you got a 27 with only a dual link ill assume you got one of the korean monitors, interesting as when i see "2x titans" i assume you have unlimited budget and would just go for the dells or something heh, but hey, gotta save a buck somewhere i suppose