Ended up coming across a deal on a R5 with Dura Ace that was unexpected. I'm pretty stoked about it. I've only ridden it twice, but enough to realize just how plush it is vs. my aluminum Cannondale Synapse. I'll still be riding the Synapse for exercise miles though.

Thanks for the input from everyone who contributed in this very long search. I'm relieved to have finally just found something.

Cycling Summer 15-0003 by Jason Garrett, on Flickr