Originally Posted by
tarwheel
Clipless pedals make a huge difference, particularly riding that distance. Like others, I recommend SPDs (double-sided) because they are easy to clip in and out of while riding in traffic and provide sufficient support and float. My personal faves are Shimano PD-M540 or M520s. You can buy for reasonable prices if you shop on-line or Ebay. BTW, in over 10 years of cycling with clipless pedals, I have never worn out any of my SPD pedals or cleats.
Nashbar used to make a Shimano SPD compatible pedals, that even looked like Shimano pedals, but were half the price. I have a pair, still good after like 7 years.