Hi there folks. I've been looking at used bike listings locally and found a few that look good and are my size frame. Not sure how to choose among these, so thought maybe you all could help me. Just going on pictures and what is known of components from the images and messages with owners. Components look roughly similar (e.g., fair amount of Shimano 105s, maybe an Ultegra here and there); 2013 Allez has FSA crank, Shimano 105 derailleurs, Shimano ? brakes. The 2013 and 2017 Allez have aerobars; 2011 Tarmac doesn't.

• ~2011 Specialized Tarmac, some cosmetic blemishes, light scraping on rear derailleur, $600-680.
• ~2013 Specialized Allez, minor cosmetic blemishes, $400-450.
• 2017 Specialized Allez, used as indoor trainer, so looks rather pristine in pics, can get $750.

And thoughts? Which represents best value, last me well, etc? What would you want to know to help differentiate? Intention is to use to get into triathlons/duathlons/road races. Live in Florida, so mostly flat courses, in case that matters.