the major benefit will come playing games so you can justify as a treat for the kids, moving from an mx2 to the fx5200 should produce a noticable improvement, study all the reviews you can find on this site and others to accertain which card will be the best, perhaps the most important consideration and one of the greatest effects on price is dual monitor support ,do you need it?
A good graphics card needn't cost more than £60 - £70. Only buy a £100 - £300 if you are intending to run your games a massive screen resolutions eg above 1280 x 768. Most graphics cards exceed your monitor resolutions anyway. So why pay for something that you cant use. Or if you can then everything is so small you cant see it.
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