I recommend the NVidia 275GTX or the cheaper option NVidia 260GTX Geforce. Those have duel DVI ports and great performance, for their price. At those resolutions, it has plenty of onboard memory. You also have the option of HDTV output, if you really want a big screen output. NVidia also has on going driver updates.
Of course I'm a hardcore gamer, the graphic card I end up spending 1/3 the total computer price as it's the biggest bang for bucks (if you have a good computer the major bottleneck these days is the graphics output).
Look around for good deals, but don't be too cheap on the graphic card. Specially if your updating the rest of the computer and have a duel core, quad core or i7 core. I use PriceSpy online here in NZ to find the best/cheapest deals, maybe you have some online price spy website there? You will find the price difference between some shops is huge!
Also make sure it will fit and has enough power! Graphic cards these days can be very large and require a minimum 550W or greater power supply. If the rest of the computer can't keep up, your'll have no end of problems installing it and keeping it stable.
(I take vodka or bourbon thx)