While washing my bike today I noticed that my rear brake pads are getting very close to being worn out. I had been watching the front ones pretty closely and assumed they would wear out the fastest. I can't see the rear ones very well since I put a rack on the back for commuting. When I bought the bike the pads looked brand new and I have put about 5000 miles on it so I would say the brakes have done well. My rims look good too, except they do not have any type of wear indicator which I don't like. I had a rim blow a sidewall while riding my mountain bike and it was scary sliding to a stop after the big bang. My question is, should I buy more dura ace pads because they wear well or should I switch to something else, like kool stops that might not wear as well but should be easier on my rims?