These are the fenders I use. They work pretty well. My only gripe (with 1st generation product), was the plastic hardware (thumbscrews etc), worked their way loose and fell off. I had to replace them with real (non-plastic hw). Aside from that, they are pretty easy to use and take about 5 minutes per wheel to set them up (or remove them).

http://www.crudproducts.com/products/roadracer/