As georgebee guessed, eventually I'd come and give my two frames worth on this, as it is a hobby.
First, a Quadro would be overkill as they are a premium workstation card and built mainly for proffesional 3D work. They are good solid cards, and if it's free sure take it.
However if you are buying, then you must refine your options to price/performance.
First for 2D office apps and Photoshop, well the Matrox P650 would likely be a perfect fit, and should cost sonsiderably less than the Quadro and actually be considerably beter for what you want to do. Of course a P750 or Parhelia would be better still, but unless you need triple monitor support immediately or don't mind paying a little more for just a little more power then th P650 should be a perfect fit. Nothing can match Matrox for 2D quality at the moment in my and many other's opinions, and that's because that is their focus, and they build with that in mind, with better chip design and filter processes to ensure 2D quality. They too have <A HREF="http://www.matrox.com/mga/products/mill_pseries/soft_bundle.cfm" target="_new">Photoshop specific plug-ins</A>
That being sai let's address the other two card makers mentioned. First, ATI, they make good quality 2D cards, and everything above the Radeon 7500 series should offer you solid 2D. Likely anything above the R9550 mentioned before will give you limited boost in performance, and your money would be far better spend on a faster CPU or faster/more RAM.
As for nVidia, their 2D quality before was mediocre, but has improved greatly, and they are close to if not equal to ATI. You should avoid the Geforce4 series because it had slower RAMDACs, which are a very important factor in the limits to what the card can do in 2D. Most FX series cards have 400mhz RAMDACs, but I have recently discovered that some of the FX5200s ship with 325-350mhz RAMDACs, so keep an eye out for them and avoid them if you do decide to go that route.
The other thing is to avoid cheap board makers, they sometimes build shody boards with DVI issues and such. Check the buyer's guide for an idea of quality builders.
In the end Matrox really is the best for your needs if you looking for the best, and while some people are a little hesitant because they are a slight premium over an R9200 or FX5600SE, compared to the Quadro their are far more suited to the task, and far cheaper. Even the OLD G4xx and 5xx cards would be comparable in quality to ATI and nV's current offerings, and those are really outdated cards now compared to their replacements.
I would recommend the Matrox P650 or P750 depending on your needs, and if money is no object then the Parhelia. <A HREF="http://www.matrox.com/mga/products/comp_chart/gseries_pseries_parhelia.cfm" target="_new">Here's their Product list.</A> Otherwsie any modern card from ATI or nVidia will give you equal 2D to that Quadro you were looking at, and likely for much cheaper.
Of course that my two frames worth, but I'm sure if you check around among people who work with still and video 2D images you'd get similar recommendations.
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