OP, if you want a good set that will last spend the money to buy a good set. Rapha or Assos have proven the most durable for me. I ride 330-340 days a year, and generally have 5-6 bibs in rotation at a time, with 2-3 getting the most saddle time. I tend to find that the high quality stuff sees the chamois sack out long before the fabric becomes translucent.