Setting aside the supposed issue of coolness (nobody really cares who does or doesn't use a kickstand), installing a kickstand on an aluminum bike such as your Cannondale is almost guaranteed to result in frame damage. Even Surly says that installing a kickstand on their frames, which are all built with high-quality steel, voids the warranty.
If you want to avoid damaging the frame, you should consider installing a rear-wheel kickstand, which is much less likely to damage the frame.