A while back when I was riding every single day I bought a "try everything" earplug kit from here: http://www.earplugstore.com/ and proceeded to use all 36 some odd earplugs over the course of a few months. The single most important thing is comfort for me. Can you ride for 3 hours without feeling the earplugs? If not, they're no good.
The best ones hands down were these, and coincidentally also the quietest: http://www.amazon.com/Howard-Leight-LPF-1-Uncorded-Earplugs/dp/B000RMFGGY
If you have exceptionally large ear canals, I found these to be similar in comfort and quietness, but a bit too large for me: http://www.amazon.com/Moldex-6870-M...qid=1422674359&sr=1-1&keywords=moldex+meteors
The best ones hands down were these, and coincidentally also the quietest: http://www.amazon.com/Howard-Leight-LPF-1-Uncorded-Earplugs/dp/B000RMFGGY
If you have exceptionally large ear canals, I found these to be similar in comfort and quietness, but a bit too large for me: http://www.amazon.com/Moldex-6870-M...qid=1422674359&sr=1-1&keywords=moldex+meteors

but they work great for ppl with big ears... :|
