I'm running a ATI 5970 graphics card with 3 24" dell monitors. Like you, I wanted ultra thin bezels but unfortunately the price was too steep and the selection limited as Samsung was the only company offering the ultra thin bezel and it was only available on their 30" monitors and bigger ($1,500 each).
Dell is always running sales on monitors and I was able to pick up the 3 brand new HD monitors for roughly $150 each. The 5970 card has a bezel compensation feature which allows the picture to pass seamlessly behind the bezels where you won't even notice them. I've also seen some people on Youtube purchase standard monitors and remove the frame in order to butt the screens up against each other. Not sure if you want to go to this trouble.