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With such a shallow gradient, you are bound to get banding by the limitations of 8-bit images, unless the SVG is intelligently dithered somehow. I tried to do this in ImageMagick but was not successful.
It seems Illustrator has the option to save SVGs with rasterized, dithered gradients to avoid this problem; Adobe probably has a good reason for doing so, even through the result is not a true vector drawing any more (bloated file size, not resolution independent)
GiMP and Photoshop do nice dithering on gradients that they generate themselves; Photoshop's are a little nicer. This is because the program knows the correct color at every point to high precision. So, I suggest the following: in Inkscape, set the area where you want a gradient to a single color. Then in GiMP or Photoshop, select that color and add a gradient fill.
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