Cygnus Recoverable SSTO Rockets family
I'm happy to present you the Cygnus recoverable SSTO rocket family. Those rockets are designed to be a cost efficient way to orbit payload (from 15 tons to 300 tons) to LKO. Their mass efficiency ranges from 15% to 19%. Then you can deorbit them, reenter Kerbin atmosphere and make a slightly powered landing as near as KSC as possible to maximize cost return. You can easily get around 95% of the dry cost of the launcher.
(all picture are clic