Care to qualify that statement? There is another thread here with a link to benchmarks showing the 2D PERFORMANCE being very similar until higher resolutions are reached, at which point the Matrox's performance begins a very steady decline, while the Radeon 8500 never breaks a sweat.
As far as 2D QUALITY goes, I have yet to see anything unbiased. I can say that I've never heard anything less than superlatives regarding Matrox's 2D quality. OTOH ATI's 2D quality is universally held in high regard, too.
Have you considered runniing anti-aliasing all the time? I'm sure the radeon handles that MUCH more quickly than the Matrox.
Also, would you, or anyone else that uses your pc, ever want to play a 3D game?
One last idea-- being that you have a generous budget and are into editing, have you looked into the Radeon 8500DV, the newest All-in-Wonder?
Most reviews rave about it.