Porteñisimo by Miguel Caló. The micro decorations are perfectly placed, as is the modern milonguero style.
Ella Es Así by Cachivache Quinteto (originally Edgardo Donato & Horacio Lagos). Pablo & Sofia rock this milonga. Fun & beautiful.
Te aconsejo que me olvides by Aníbal Troilo y Francisco Fiorentino. Beautiful, rhythmic, and flowing. A great example of dynamics to strong music.