Will Geforce 8800GTX do it?
That card ( I own one...) is perfectly able to handle even higher resolution textures than what we normally use (other than being able to handle FSX, for that matters...).
The problem is not the card itself, the stuttering is not caused by the card, is caused because the FS9 engine is not able to use multi-core to load textures so, whenever a certain amount of texture data needs to be sent to the video card, the sim will still use the one core FS9 is running on, possibly stalling it and thus creating the stutters. In FSX, instead, the loading is done with a spare core, which is usually always available, since FSX doen't take all cores for itself during normal flight. That's why those fixes are for FS9 only.
The only solution that seems to work, is just decreasing the amount of textures data to be sent, by lowering their resolution, and this is what the resizers do.