I use Shimano Ultegra pedals on my Cannondale, and I just bought a pair of Shimano 105 pedals for $69 at Performance Bike for my back-up bike - a Trek 2100 WSD. I like the Shimano SPD-SL's because they have a wide, stable platform and I find them easy to clip in/out. And since both the Ultegra and 105's are essentially the same pedal (only a weight difference), they use the same cleats...so now I have an extra pair of brand new cleats when my current ones need to be replaced.