I understand exactly where your coming from and what your saying is spot on. Your always hearing about Geforce range of cards having poor 2D image quality. The GF3s however, are still affected by this just as much as their earlier cousins. The GF4 on the other hand isn't. nVidia are now using, or so I have read, better filters on the output side of the card to give better quality 2D imaging. I have read plenty of complaints regarding 2D image quality on GF3s, so don't get the idea that GF3s are perfect either.
The problem I have is related to convergence which has nothing to do with the output quality of the video card. Convergence is caused by a misalignment of the electron beams hitting the poshor dots on the screen. Just read Toms recent review on 19" monitors. Out of the top three, Sony didn't even get mentioned. In fact, the top 3 were brands I have never even heard of. If Sony had included the ability to manipulate the convergence with BETTER onboard controls, this wouldn't even be an issue. The tube is fine, it's the circutry(Onboard Computer) that controls the tube that's the problem. That's why other monitors are coming up trumps over the Sony. Because they include better controlling options to fix screen image problems. I used to use a 19" Hitachi CM751. It's now being used on my other computer I just recently built. The image quality on that is perfect. Whilst the image on the screen isn't as bright as on the Sony, it has absolutley no convergnece errors at all and obviously no blurry/fuzziness either. It has one of the most consistent images across the entire screen I have seen on any monitor. And that was using my 3D Prophet (GF 256). It uses a shadow mask instead of the Aperture grill of the Sony monitor. In my view, Aperture grills are only superior to shadow masks when all the options are available to correct the problems associated with Aperture grill technology.
Just because a particular brand of monitor uses a Sony Trinitron tube doesn't instantly vindicate that monitor. If your going to buy a monitor, make sure it has plenty of options to adjust all aspects of the image. In particular, if it's a Aperture Grill type unit, ensure it has a very good convergence control system. At least anything better than Sonys attempt anyway.