Since my father is a professional cellist with a REALLY nice cello, I have a little experience with this. I have found in general that small diaphragms seemed to work a little better for me then large diaphragm mics. They were a little more "controllable". The last time I tried different mics I tried AKG 414Buls, AT 4050, BLUE Blueberry, AKG 451, and Royer 121. What I discovered sounded the best to me (and him) was an AKG 451 at about 1 45 degree angle downwards so it was pointing just above the bridge, and placed about 4 feet from the bridge. Then I used the Royer down low and turned it sideways. I focused it at the F hole about 18" from it, form the side with the high strings, slightly angled back into the center of the cello. I turned the mic sideways so as not to interfere as much with any bowing technique.
During mixdown the Royer (ribbon mic) took up about 75% of the signals when blended back together. The Ribbon really gave a nice and full (but not too exaggerated like the LD mics did) low end. What was really nice though was how the highs also came out so smooth and extended without being harsh or to "stringy" sounding. The 451 from above helped retain a little of the "distant" feeling without being too washed out sounding.