I use the Kool Stops Salmon/Black dual compound pads. They are awesome! Awesome braking in the dry and braking is not reduced too much in the wet.
And the kool stops are only ~$8 a pair. Best upgrade for the money on bike.
BTW I am using the stock Tektro brakes on my CAAD9
EDIT:These are the pads I have:
http://www.amazon.com/Kool-Stop-Dura...1830969&sr=8-1
Have lasted me over 4000 miles in the Santa Monica mountains. We have some very steep and fast descents here.
They are finally starting to look like they are wearing out.