I have an HP2000c and I love it! The black printhead went bad but HP support was awesome in that they replaced all four for free.
If you print in color, one will always run out faster than the others depending upon what your output looks like.
Yellow is the most common as it mixes with the other two to make the greens, dark blues, and dark reds.
You may be seeing the cyan run out faster if the colors you like to print are on the blue side of the spectrum. Take a close look at the output you are printing.