Well as the weather warms up, I have reproached this subject. I have decided to go with the KoolStop Road Holder Dura pads/holder. I have also found in my research that normal 105 calipers will not fit the Synapse. The stock Promax are long reach and would need to be replaced with either the Tiagra R451's or the Ultegra R650's. The R451 calipers might be in my future, but for now I'm going to check out the pads.

Thought I would update with some more info in case someone came searching.