thanks so much man I actually have the ASUS VG248QE which is the same monitor you mentioned except its 24inches.. so I guess I will be using the DVI-D then.
Make sure that its dual link DVI-D. If you don't have the option for 144hz, try the other DVI connection, some video cards don't support dual link on all their DVI connections.
Edit: Nice, I was not aware of that monitor. It is indeed 144hz. According to the Newegg info, both dual link dvi-d and displayport can get you 144hz from that monitor, but only the DVI option gives you 3D Vision.